Title: Lineage Ligno: A Family of His Own

Summary: It started out as a simple summer assignment; it ended up changing his life forever. After using a lineage potion as part of a combined potions and history project, fifteen year old Harry Potter finds out he is not a Potter after all, and that his father is a self-proclaimed Sociopath who committed suicide nearly three years ago. Harry wants answers so he goes to the one man who knew his Dad best, Dr. John Watson.

Rating: T

Warnings: Mentions of Abuse, possible violence, possible mild language, possible light/non-graphic slash

Disclaimer: I own nothing but my ideas for the AU plot, as well as any and all errors in spelling and grammar. I do not own Harry Potter J.K. Rowling does. I do not own Sherlock; that right goes to Steven Moffat, Mark Gattis and Sir Arthur Conan Doyle. Any recognizable lines, characters, or places in this work are from or inspired by the Harry Potter books and Movies and the BBC Sherlock Series.

Chapter 9

It was a bright sunny afternoon that found two men setting on a park bench seemingly enjoying the day.

At first glance the men seemed perfectly ordinary, passerby's barely gave the gentlemen more than a passing glance. One of them a younger man with blue eyes, brown hair and an average build, while the second was a grandfatherly gentleman who's eyes seemed to sparkle with a hidden knowledge and an extraordinarily long beard; in reality however, there was nothing ordinary about these two men which would have been obvious if anyone had stopped to listen to their coversation.

"If you don't mind me asking sir, how is it that a man of your apparent Muggle decent, managed to find and responded to my cautions inquiries for someone for your talents in the Wizarding world?" asked the older man.

The other man laughed merrily. "It is my job to know these things, Albus Dumbledore." the second man said a Irish accent just discernible in his speech.

"I must admit that your adverts caught my attention, after all what would the illustrious leader of the light need with someone like me hmm?"

"I am afraid that I am not quite ready to offer that information yet, after all sir you have yet to introduce yourself, nor told me your skill set." Dumbledore replied with an eyebrow raised expectantly.

"Ah yes I do hope you will forgive the me for not introducing myself, I tend to wait for names until after I have been hired, paranoia is a hazard of the profession you know. As for my skills, I can do anything you need really, make you disappear, make someone else disappear, frame someone, steal something, forgeries, murder, anything you need really. I have the resources and the talent to do it all, as long as you have the financial resources of course."

Dumbledore looked off into the distance, this man seemed so proud of his illicit talents and was definitely qualified for the job he needed done, but was he, the leader of the light really willing to sink so low as to work with a murderer, extortionists and whatever else this man may be to get Harry back?

Yes, yes he was the Wizarding world needed Harry, they needed him to continue to be their light, their beacon of hope. While it was true the boy had fallen out of favor recently due to some nasty allegations about the Diggory boy's death, he could easily clear up the misunderstanding with a copy of Harry's memories and an official declaration from the Ministry stating their authenticity. The only things standing in his way was the boy's new guardian and the child's biological father and once they were out of the way...

"I am quite certain I have the required funds and would like to employ your services; though this cannot be traced back to me, it is of the upmost importance that this not be traced back to me." Dumbledore said imploringly.

The man rolled his eyes "Of course, the people who pay for my services always require discretion, a rather boring lot you people never wanting in on the action, never wanting to get your hands dirty." the man said his voice soft and his eyes alight with malicious anticipation.

"Very well," Dumbledore said as he pulled a leather pouch out from inside his voluminous robes, " I do believe this should cover part of it." he said handing over the pouch. "You shall receive the other half once the deed is done."

"Excellent " the man said after a quick glance at gold inside the pouch. "So, Albus Dumbledore; pillar of all things light and good, what can I do for you?" asked the man as he rubbed his palms together in gleeful anticipation.

Dumbledore took a breath, after this there would be no going back. "I need to regain control of a child who was once in my custody. The child and I had a, shall we say falling out, and he unfortunately managed to gain new legal guardianship, as well as discover and locate a biological father that was previously unknown."

"Ooo, intriguing, the child must have some skills if he was able to escape the great Dumbledore as well as track down a person under the radar. Who is the child? That is, what is his name, age, general description and last known location?" asked the man getting down to business.

"The boy is fourteen, nearly fifteen years old. He is short in stature, skinny but muscular. He has messy black hair, green eyes, has glasses and a lightning bolt shaped scar on his forehead just above his right eyebrow. His name is Harry Potter and his last known location was in central London." said Dumbledore.

"Oh this is good! The Savior of the Wizarding World has gone rouge, and the leader of the light wants him kidnapped and sent back home. This is priceless." laughed the man giddy with delight as his took down the information.

"Now I need the names of the Golden boy's Daddy Dearest and Guardian Angle, and a more specific location than London if you please."

"Of course the guardians name is John Watson, the father is Sherlock Holmes and the address is 211 B Bakers Street."

"WHAT! NO!" shouted the man, springing from the park bench and catching the attention of some of the other park patrons. "No that is not possible!" he said brining his voice down to a harsh whisper. "There is no way that Sherlock Holmes has a son that I don't know about!" the man said viciously his accent coming through strong.

"I assure you it is quite possible, apparently even he did not know until a few weeks ago. I take it you know the man?" Dumbledore inquired.

"Oh yes, we tend to...dance well together. At least we did until his Doctor got involved." the man muttered as he paced franticly back and forth.

Dumbledore looked at the man in confusion, he got the distinct impression that he was missing something, but as long as the man got the job done he didn't care. "Will your association with Mister Holmes impede your ability to do your job?"

"What?" asked the man looking up distractedly as he abruptly stopped his pacing . "No, oh no if anything this will insure that I am personally involved in the situation."

Dumbledore began to feel uneasy; the man had a wicked gleam in his eyes and Dumbledore couldn't help but feel he may have made a deal with the devil. "I don't rightly car what you do with the two gentlemen but Harry is to be handed over to me, or left to return on his own in a mostly unharmed condition with no permanent damage or our deal is off."

"Yes, yes; you will get your Golden Boy back in one piece." the man said exasperatedly.

"Excellent, well then I suppose I shall go, I expect to hear from you soon Mister?" Dumbledore paused hoping to get a name for his associate.

"I should have him in a few weeks, give or take, and the name is Moriarty, James Moriarty."

"Very well Mister Moriarty, I look forward to seeing you in a few weeks." said Dumbledore as he stood up and began walking down one of the parks many paths.

"Oh Albus Dumbledore, I said that I would have him in few weeks not that you would. In fact I think I shall have the whole family and turn it into one big party!" exclaimed Moriarty as he pulled out his phone quickly shooting off several texts setting his plans in motion. Oh yes life was good he thought as a menacing smile spread across his features, Sherlock and company wouldn't know what hit them.

LOLAFOHO

Harry sighed as he studied the Arithmancy problem in front of him, knowing his tutor, Bhaltair MacCance, and older kindly and vastly intelligent Scottish gentleman who vaguely reminded Harry of a combination Professor McGonagall and Remus, would be expecting him to turn it in tomorrow, but he simply could not get his mind to focus on the last problem on the page.

When Sherlock and Mycroft said they would be finding a tutor to continue his magical education, he hadn't imagined that they would have found one so quick, or that they would start immediately, summer or not. He also hadn't expected to be forced to learn all of the subjects including Ancient Runes and Arithmancy. He wasn't really complaining though, Runes was a interesting subject, and Arithmancy was very similar to Muggle maths, something he was quite good at. This last problem however was a trickier one, and Harry's heart wasn't really into solving it as his eyes kept wandering to the clock.

Sherlock and John had been called out by the Yard earlier in the day; there had been a string of suspicious murders lately all with very little evidence left at the scenes and all of the victims were killed the same way, and all had the same distinguishing cercumstances, making everyone believe they were the victims of a serial killer. Harry didn't know anymore than that as, John and Sherlock were carful not to discuss the more gruesome cases in front of him.

Sherlock had however been helping Harry with his observations and deductions, and both Sherlock and Greg had promised that once his skills were fine tuned and he was a little older he, could help them on a few of the tamer cases. Harry really liked the Detective Inspector and couldn't help but smile as he remembered the day he met Lestrade for the first time.

FLASHBACK

Harry was in the process of working on his summer potions assignment, an interesting if involved essay on venoms and there uses in medicinal potions, when the sound of frantic footfalls and the banging opening of the flat door jarred him out of his work. Turing to face the intruder Harry found himself face to face with a stressed out looking middle aged man with graying hair inelegant silver eyes, a protective, masculine aura that was a strange combination of brown and aqua, who was currently looking at Harry with exasperated and slightly fearful expression.

"Oh Bloody Hell! Tell me he didn't, I'll bloody well arrest him, the idiot, and where is John, isn't he supposed to stop things like this from happening?" said the man as he paced back and forth.

Harry watched the man with a mix of confusion and amusement; Harry gathered that this man knew John and Sherlock obviously he knew them pretty well as he let himself into the flat, and it was equally obvious that something about Harry's presences here had upset him. Harry watched the man for a bit longer before deciding it was time to interrupt.

"Um sir, are you alright? Maybe you should sit down. Can I get you some tea or something?"

The man stopped his frantic pacing and faced Harry.

"Right, oaky" the man took a breath and walked closer to Harry, before kneeling so that he was at eye level with him.

"I'm Detective Inspector Lestrade, I'm not going to hurt you, your perfectly safe now, but I need you to answer a few questions for me okay?"

Harry's confusion grew, why was the man acting like this? John and Sherlock had told him a lot about the Detective Inspector, but right now Harry was concerned about the man's mental health. In the end Harry decided to play along, at least for a bit, in the hopes he could figure out what was going on.

"Sure, not a problem Detective Inspector."

"Great, first things first what's your name, your age?"

"My Name is Harry Potter, and I'm fifteen sir."

"Excellent," Lestrade said as he wrote down the information in his note book."Alright, now how long have you been here, how did you meet Sherlock and where do you live?"

"I live here at 221 B Baker street sir, with John and Sherlock, I have been here for, what a few months I guess, and I met John at the clinic and I met Sherlock through John. Sir what exactly is going on?" Harry asked his confusion reaching an all time high.

"John is in on this too?" the Inspector asked looking as if he had been slapped.

"In on what Detective?"

"How have they been treating you, do they feed you? They don't, oh God, tell me Sherlock doesn't use you for experiments!"

"What? Why would he do that? I do get to help sometimes, but he doesn't use me as the experiment sir. Seriously what is going on Inspector Detective?

"Could be Stockholm Syndrome if they had him long enough, I can't believe that John would just go along with this." mumbled the Inspector.

Suddenly it all clicked and Harry understood why the Detective was acting so strange, the man thought Sherlock and John had kidnapped him! Harry couldn't stop the laughter that overtook him, he couldn't believe that the Inspector thought he was a kidnap victim!

"Um kid, Harry, are you okay?" the Detective asked looking at him with concern.

"You-you think-Sherlock and- John kidnapped me?" Harry gasped out between fits of laughter.

"Well-"

"Greg, good to see you mate, been waiting long?" asked John as he came in hanging up his coat.

The Detective startled slightly not having heard the man come in.

"Ah brilliant, another case, I needed another case!"

"Sherlock you just finished a case!"

"But John that was thirty minutes ago!"

All of this was so utterly ridiculous that Harry couldn't help but laugh harder, he swore his ribs were going to crack and his stomach muscles were burning.

"Harry, what's so funny?" asked John.

"The- The- He- thinks- kidnapped-me!" Harry spit out through his fit of giggles.

"What? Here, sit up and drink this." John said as he handed Harry a cuppa.

After a moment Harry managed to settle enough to drink without chocking, and he downed the cup of tea.

"Now what on earth is going on in here?"

"The Detective Inspector, he- he thinks that the pair of you have kidnapped me!" said Harry, only a few giggles escaping.

"Greg! You know I would never kidnap a child!" exclaimed John looking offended.

The Detective rubbed that back of his neck nervously "Well I knew you wouldn't normally, but who knows what this one," he gestured at Sherlock "could convince you to do?"

"Oh please Lestrade, there is no way John would ever allow me to kidnap a child for experiments. Besides why would I need to kidnap a child when I have one of my own?"

"What do you mean one of your own?" asked Greg.

"Oh a suppose introductions are in order. Harry, Detective Inspector Gregory Lestrade Scotland Yard's finest- Detective Inspector this is Harry Potter, soon to be Harry Watson-Holmes, my son and John's ward."

"Your, your son, as in biological..."

"Yes, yes, though John is as much his father as I am, biology isn't everything you know." replied Sherlock off handedly as he examined something under a microscope, turning only when he heard the thud of Greg's body hitting the floor. "The Yard's finest indeed."

END FLASHBACK

John had revived Greg and after some explanations and apologies everything went back to normal, and Harry and the Detective Inspector, Greg- as he insisted Harry call him, became friends of a sort, and the man was someone Harry looked forward to seeing. If only meeting the rest of the Inspector's team had been as pleasant.

FLASHBACK

Harry, Sherlock and John had been out running errands and, at Sherlock's insistence, helping Harry memorize the ins and out's London's streets and alleyways. Harry and Sherlock were having a great deal of fun, while John just went, with it indulging the two and their strange bonding. The fun was interrupted however by a call from the trio's favorite Detective Inspector, asking for Sherlock's help at a crime scene a few blocks from where they were.

Naturally Sherlock agreed to assist and the trio walked the few short blocks to the scene.

"Sherlock, John, Harry." Greg greeted them. "Listen Harry I can't let you in this time you'll have to wait outside the tape."

"It's okay I understand." Harry said as Sherlock and Greg slipped under the Police tape and headed down the alley where Harry assumed the murder took place. John however hesitated.

Harry sighed. "You can go John, I'll be fine waiting right here."

"Are you sure Harry?"

"Yes John, I haven't had a flashback or a panic attack in quite some time and I am surrounded by Police, so no one is likely to snatch me, now go get to Sherlock before he offends all of Scotland Yard or explodes from all of the 'idiots he is forced to put up with.'" said Harry with a smile.

"Well alright then, shout if you need us." John said as he hurried after Sherlock.

Harry leaned against one of the buildings beside the alley and pulled out his mobile scrolling through to find his book app knowing he could be waiting awhile. One of the many things Harry had discovered about himself while staying with John and Sherlock was that he enjoyed reading for fun, if he had nothing else to do. He would never be a bibliophile like Hermione, but he enjoyed a good fantasy or adventure story, and even the occasionally mystery or horror story.

Harry was just getting to the climax of his current story, when someone started shouting.

"Oi you kid, what are you doing, go find somewhere else to loiter this is a crime scene!" the woman shouting and walking Harry's direction was taller than he was but still petite, with shoulder length curly brown hair, darker skin and an attitude you could see a mile away. Her aura was sickly putrid yellow green that made Harry nauseous just looking at it. This must be Sally Donovan. John and Sherlock had warned Harry about this woman and her jealousy and rude comments. Apparently she along with a man named Anderson used to give Sherlock an extremely hard time, and while Anderson had apparently turned over a new leaf, Donovan was as spiteful as ever.

"Boy you've got to go you can't be here, scat." she said rudely as gestured for him to move.

"I'm sorry miss, I'm waiting for someone I was told it was alright to be here." Harry said as politely as he could.

"Right, and who exactly told you that?" she asked clearly not believing his story.

"Detective Inspector Lestrade said I had to wait out here, so here I am, waiting." Harry replied starting to feel annoyed.

"Alright, say I believe you, then who might you be waiting for, 'cause I know all of the people in there and not a one of them in there has kids that look like you and I don't remember you comin' with any of them."

Harry sighed, he just knew this was going to end badly. "I am waiting for John Watson and Sherlock Holmes, I came with them."

Donovan looked surprised at first though her expression quickly transformed to one of suspicion.

"Your here with the Freak?! How did he even get a hold of you? Did he follow you home?"

Harry froze fighting down his instinctual reaction to the word 'freak' he remembered to breath evenly, and focus on the present. Though in hindsight that may not have been the best idea, as he finally registered that the woman had called his Da-Sherlock a freak.

"Sherlock is not freak!" he shouted and a strong breeze whipped through the alley causing Donovan to pull her coat around her in an attempt to block out the cold.

"That man is menace to society and should be locked up before he kills someone!"

Another gust of wind blew through and this time Harry recognized it as his magic acting up, he need to calm down before something bad happened to Donovan.

"Is everything alright over here?" asked an unfamiliar voice just as a familiar hand landed on his shoulder and calmed his magic.

"Well done Harry." Sherlock whispered warmly "no flashback this time."

Louder he addressed Donovan, "Ah Sally nice to see you again, I see you have met my son Harry."

Donovan's mouth fell open and her eyes looked like they were about to bug out of her head.

"Your son, how does someone like you get a son?" she asked clearly horrified.

"The usual way I would presume Sally, now if you don't mind Lestrade wants you." the unknown bearded man said coolly.

"Fine but this is not over." Sally said as she slipped under the police line and stalked down the narrow road.

"Sorry about her," apologized the bearded man.

Harry turned towards the man who was watching him with a polite smile. The man was taller than John but shorter than Sherlock, wore glasses, had reddish hair and beard and a dark blue aura that told of inelegance and seriousness.

"I'm Phillip Anderson, the lead crime scene investigator." said the man holding out his hand.

"Um, I'm Harry, Sherlock and John's s-son." stuttered Harry as he cautiously shook the man's hand.

"Pleased to meet you Harry, and a word of advice, just ignore Sally, when it comes to Sherlock, she is a right pain in the arse. "the man said before walking away.

"Come Harry, let's go."

END FLASHBACK

While Harry and Anderson were not as close and Greg and Harry, the man was surprisingly welcoming and the few times they had to interact were pleasant, though Harry avoided Donovan like the plague.

Checking the clock again, Harry sighed . He was a little worried John and Sherlock hadn't checked in several hours, and the last time they were called out to a crime scene in which the serial killer was a suspect, they were back much sooner.

He knew he was probably being ridiculous, but an uneasy feeling had been growing in the back of his mind, and he couldn't shake the notion that something bad was coming.

Trying to shove the worry to the back of his mind, Harry attempted to focus his attention back on his Arithmancy when a wave of...something crashed through his body. It was icy cold, but left a tingling burn in its wake, the closest thing he could compare it to was when your foot falls asleep and the circulation is suddenly returned, only the sensation enveloped his entire body. The sensation lasted for only a moment or two, but for Harry, it felt like an eternity.

Harry had no idea what had caused the disturbing sensation, but he did know it meant nothing good. Coupled with the nagging feeling of dread he couldn't seem to get rid of, Harry instinctively knew that something was terribly wrong.

Getting up from his seat, Harry franticly searched for his mobile phone, and dialed John's number, as Sherlock hardly ever answered his phone when he was on a case.

"Come on John pick up, pick up." After six rings the phone went voice mail and Harry hung up, and immediately dialed Sherlock's number, the end result was the same.

Trying not to panic, Harry tried both phones again, only to have them go straight to voice mail after the first ring.

Harry was just starting work himself in to a real tizzy when he heard a single set of footsteps headed up the stairs. He let himself hope it was John or Sherlock and prayed to whoever was listening that his family was safe. When the door opened and Greg stepped through covered in dust and grime, Harry felt his anxiety go up another notch; when he saw the man's face, his heart plummeted.

"No, no, no." Harry mumbled franticly his hand out in front of him as if he could ward of the bad news he knew Greg was here to deliver, by keeping the man at a distance.

"Harry,-"

"No, No!" shouted Harry backing away from Greg.

"Harry please listen to me, just listen okay." Greg said his hands raised in a placating gesture as he slowly took a step closer to him.

"No they're not dead, they're not!" Harry shouted trying put more space in between himself and Greg. He felt his magic slipping out of his control and he did not want to hurt Greg. Taking a deep breath he manage to calm enough to bring it back under control.

"No Harry, we don't think they are, please just listen to me for a second, yah? We were working the case when an explosion, a smoke bomb went off. It wasn't enough to hurt anyone, just a bit of damage to the buildings structure, and a Hell of a lot of smoke." Greg said oblivious to Harry's internal struggle.

"A distraction then?" asked Harry flatly, he didn't like where this was going.

"Yah it was but how did you, never mind why am I asking how you know, you Holmes' always know. Anyway once the smoke cleared we did a check to account for everyone, and we found everyone except for,"

"Sherlock and John right."

"I'm sorry Harry, but it looks like they've been kidnapped, we found a note, now we don't know what it means but it is a place to start."

Harry felt numb, he couldn't believe this was happening to him why was it always him.

"What do they want, the kidnapers, did the note have like, I don't know ransom demands? Isn't that how it usually works?" inquired Harry eerily calm. He could feel Greg watching him carefully probably waiting for him to explode.

"There were no demands just a cryptic message." the man replied.

"Can I see it?"

"Harry, I don't know if that's such a good idea, and it's part of an open investigation and.."

"Please Greg, please," begged Harry desperately his calm facade slipping. "I- I need to see it, please I can't let anything happen to them, what if I see something you missed, Sherlock's been teaching me and-"

"Alright, Harry all right." said Greg stopping him mid ramble. The man pulled and evidence bag out of the inside pocket of his coat and handed it to Harry.

"Don't open the bag." the gray-haired man warned.

Harry flashed him a irritated look before focusing on the note inside the bag and what he read made him see red.

The Bumblebee misses his Golden One his sheep who strayed from the flock,

and someone's been keeping secrets naughty, naughty, Sherlock.

So if you want the duo back, if you're in greatest need, you had better hurry up

and find an On Afforested, lead!

Harry felt his magic escaping him in violent tendrils but he could not pull them back. Dumbledore, this was all because of Dumbledore.

The windows in the flat exploded shards flying everywhere, and the furniture in the began to levitate "That Bastard, I'm going to kill him!" Harry shouted his fury palpable in the magic in the air.

Suddenly arms surrounded him pulling him to a warm, soft yet muscular chest, as hands carded through his messy locks. The arms were familiar and caused the touch caused his magic to settle slightly opening his eyes he was greeted to a familiar form.

"He took them Uncle Myc, he took My Dad and Father." Harry whimpered as he collapsed in both magical and emotional exhaustion. His Uncle carefully guided him to the floor and Harry couldn't help but burrow into his uncles embrace.

"I know Harry, I know" the man said softly as he continued to run his fingers soothingly through the teens hair as Harry focused on reigning in his wayward magic. His uncle continued his soothing ministrations for a time, even after Harry had calmed. Eventually however the man broke his silence.

"We shall find them Harry, I promise we'll find them, and those who took them shall pay dearly."

Harry did not respond but he believed him. Harry could hear the steel in his uncles voice and he knew that together they would find those who were holding is dads' and they would make them pay. As for Dumbledore, well Harry would make sure the man got what he deserved. Dumbledore had made a grave mistake when he took those whom Harry held dear, and Harry was going do everything in his power to make the man suffer for it.

A/N: This chapter is dedicated to all of the Guest Reviews and any reviewers I have forgotten to or missed responding to! Thanks so much for sticking with me! I apologize for the long wait but my sister just got married a few weeks ago and the past several months have been nothing but wedding drama, wedding preparations, and well my life has been revolving around her wedding and at the end of the day my poor brain was in a state of wedding exhaustion and was not capable of putting words on paper. I have since recovered and hope the chapter was worth the wait! : ) Also I know the note was cheesy but it was the best I could come up with, any guesses as to where Moriarty is holding Sherlock and John? And don't worry Harry is not going to become a crazed killer bent on revenge and out for Dumbledore's blood, he just said that he would make him pay, not that he would kill him.

Thanks again to everyone that had followed, favorited or reviewed, it is much appreciated!

Godiva9