Addison tapped her foot and hummed under her breath as she waited outside 221B Baker Street for Sherlock to arrive. It had been late when she managed to finally get back to her flat and catch a few hours' sleep before she was up again, showered and dressed to find out what Sherlock wanted to talk about.

Glancing up and down the street, Addison caught sight of a man leaning heavily on a walking stick coming her way, giving him a small smile, she looked the other way but was surprised when he came to a stop beside her.

"I take it he's not in."

Addison frowned slightly at the man, "I'm sorry, do you mean Sherlock Holmes?" she asked curiously, looking him over again.

"Tall, strange and knows your life story with one look?" the man chuckled and Addison couldn't help but smile, "yes, I mean Sherlock Holmes."

"I take it you're here to enlist his services?" Addison just hoped Sherlock wouldn't be his usual arrogant self with this one, he seemed nice "Just to warn you, don't take what he says to heart. He can be brash but you can easily ignore it. I know I do."

The man shook his head, "Actually, he offered to flat-share with me," he indicated to the building, "this is me seeing it for the first time."

He looked confused as Addison stared at him with widened eyes, "Is something the matter?" he asked slightly uncomfortably as Addison remained still.

"Sherlock… asked you to move in with him?" Addison repeated and then smiled, "He actually asked you?"

"I'm sorry, who are you?"

Shaking her head, Addison offered him her hand, "Sorry, I'm Addison Hart – a friend of Sherlock's."

"John Watson, pleased to meet your acquaintance," John shook her hand and gave her a small smile.

Addison still couldn't believe that this man was going to be living with Sherlock and actually felt a little sorry for him: he didn't know what he was in for. "Just to warn you… Sherlock can be a little, strange at first but you'll get used to it."

"Strange… how strange are we talking here?"

"He has a skull that he occasionally talks to… and likes to experiment with body parts," Addison added with a shudder remembering the tongue that had been in the bathroom sink when she first came by to see his flat, "he also will just walk out without a moments warning and come back days later."

John looked taken aback and rubbed the back of his neck, "I wasn't quite expecting that," he murmured, thinking over her words before he frowned, "hang on a minute, did you say a skull?"

"Don't worry, it's his friend most days. Although it can get a bit tense when they argue," Addison glanced over John's shoulder and seen a taxi pull up behind them and she smiled as the man in question stepped out and looked over at them both. "Here he is now," she said, rolling her eyes "late as always."

"Hello," Sherlock said offhandedly as he paid his taxi fare through the window.

John turned at the sound of voice and nodded politely, "Ah, Mr. Holmes."

"Sherlock, please," he replied, shaking John's hand as he came to stand next to them, "I see you've already met Miss Addison Hart."

"Well, well, never thought I would see the day you would willingly have a room-mate," she said teasingly, folding her arms, "does he know what he's walking into?"

"Now, now, play nice Addison."

"We only met yesterday, so no," John admitted and then looked up at the building "well, this is a prime spot. Must be expensive."

Sherlock stood with his hands behind his back as he surveyed the street, "Oh, Mrs. Hudson, the landlady, she's given me a special deal. Owes me a favor."

"A favor?"

Addison watched as Sherlock stepped forward with a blank expression on his face, as he usually did when he told this story. "Few years back, her husband got himself sentenced to death in Florida," he said quietly, "I was able to help out."

"Sorry, you stopped her husband being executed?" John asked, sounding slightly impressed.

"Oh no, I ensured it."

Addison bit back a smile at John's shocked look as Sherlock knocked on the door and moments later, Mrs. Hudson stood in front of them beaming when she seen who it was. "Sherlock!" Mrs. Hudson said affectionately as she hugged him close, "And you've brought Addie with you, how lovely!"

"It's good to see you again, Mrs. Hudson," Addison said happily, allowing the other woman to hug her tightly as well, "sorry I haven't been around much."

"That's alright dear, you've been kept busy with that job of yours."

Sherlock indicated to John, who had been waiting patiently in silence to be introduced "Mrs. Hudson, Dr. John Watson."

"Hello, come in," Mrs. Hudson said kindly, stepping back to let them pass her into the hall, "why don't I let you show your little friend around Sherlock?"

"Sounds like a plan," Sherlock said quickly and made for the stairs, "Shall we?" he glanced over his shoulder at John as he began to ascend the stairs.

Addison began to follow and heard John sigh behind her, "There would have to be bloody stairs," he muttered, his stick making a loud click each time it touched the ground.

Sherlock waited until they were both on the landing before he opened the door to the flat and strolled inside. Addison refrained from sighing out loud when she seen still unpacked boxes littering the floor and the dusty bookcase now filled with dusty books that had been shoved in haphazardly.

"Well, this could be very nice," John said quietly, looking slowly around the living room before walking towards the kitchen, "very nice indeed."

"Yes, yes I think so," Sherlock shot a smug look at Addison while she rolled her eyes at him, "my thoughts precisely, so I went straight ahead and moved in-"

"-soon as we get all this rubbish cleaned out."

Both men stopped talking over each other and John's eyes widened at Sherlock's while the other man simply looked taken aback. Addison sat down on the desk chair and smiled widely at Sherlock who avoided eye contact with her while he headed over and made an attempt to make his desk look tidier.

"So this is all…" John looked around the messy living room with new eyes and looked embarrassed.

Sherlock cleared his throat, "Well, obviously I can, um, straighten things up a bit."

"You'd need a skip for that, Sherlock," Addison said sweetly, grinning when he shot her a frown and stabbed a knife into the mantelpiece, "as most of what you own is junk."

John paused for a minute, his eyes moving along from the knife to another strange object on the mantelpiece, "That's the skull then, I take it," he said quietly, glancing at Addison.

"Indeed it is."

Sherlock's frown deepened, "Friend of mine," he muttered then put his hands in his pockets and thought for a moment, "well, I say friend…"

"Look forward to restless nights hearing him argue with it," Addison whispered to John, who was still stunned as he looked at the skull, "I don't envy you."

"Yeah thanks for that."

Before Sherlock could say anything, Mrs. Hudson entered the room, her heels clicking on the floor "What do you think then, Dr. Watson?" she asked and then smiled a little at him, "there's another bedroom upstairs, if you'll be needing two bedrooms that is…"

Addison shared a smile with Sherlock as he removed his scarf and coat: Mrs. Hudson could be a fine source of entertainment sometimes as John would learn in time if he chose to move in. "Of course we'll be needing two," he said dryly, standing to attention with his hands clasped behind his back.

"Oh, don't worry. There's all sorts around here," Mrs. Hudson said quickly and then pointed to the wall behind her, "Mrs. Turner next door's got married ones."

Addison couldn't help a little snigger as she looked up at the baffled John Watson, "We're all friends here, Dr. Watson. You don't need to worry about being judged."

While John tried to compose himself, Mrs. Hudson walked over to the kitchen and let out an exasperated sigh, "Oh Sherlock," she said, shaking her head at the man who looked up at the mention of his name, "the mess you've made."

Addison crossed her legs and glanced at her phone while John made himself comfortable on the armchair and Sherlock began to finally unpack some of his belongings, she frowned a little at a missed phone-call she had from a private number and seen that she had a voice-mail. She couldn't help but wonder who phoned her as she rarely gave her number out and kept this one as private as she could, with a lot of help from Mycroft.

"Excuse me, I've got to make a phone-call," Addison said quickly, standing up and putting her bag down, "I won't be long."

"I hope it's not work," Sherlock said quickly, glancing up and his eyes narrowed as he looked over her "or something worse…"

Addison frowned, "You stop doing that for a start," she said, pointing a finger at Sherlock, "you promised not to analyze me anymore."

"And you promised to tell me when something was wrong."

Out of the corner of her eye, Addison could see John watching their exchange with interest and sighed as she held out her phone, "I have a voice-mail and I'm going to step outside and listen to it, nothing's wrong, I promise. Is that alright with you?"

"Don't take too long, I still need to talk to you."

Addison stepped out and heard John and Sherlock conversing as she held up her phone and accessed her voice-mails. Holding it up to her phone, she listened for a moment and then frowned when she only heard the sounds of traffic and people talking. Had someone phoned her by sheer accident and left the phone in their pocket while it recorded the world going by?

Highly unlikely but she didn't know what else it could be.

Stepping back in, she seen Sherlock standing by his laptop and looking smug while John simply looked shocked. "Everything okay?" Sherlock asked, his eyes flickering over to Addison and the triumphant look fading as he did.

"Think they got the wrong number," Addison said honestly, putting her phone away "just heard traffic. There wasn't really a message left."

Mrs. Hudson came out of the slightly tidier kitchen with the latest newspaper in her hands and Addison cringed inwardly when she seen a picture of her, Lestrade and Donovan on the front, "What about these suicides then, Addison? Have you figured out why they're happening yet?"

"Not yet, Mrs. Hudson," Addison sighed, her head beginning to hurt at the mere thought of her current case, "it's a tricky one."

John raised an eyebrow at her, "That's you on the cover," he said, "are you a police officer?"

"Detective Inspector Hart, at your service," Addison said, smiling a little at him, "trying to solve these three suicides along with my fellow officers."

"Four."

Addison turned to Sherlock with an arched eyebrow and she seem him looking intently out of the window, "What do you mean four?" she asked.

"There's been a fourth. And there's something different this time," he said, glancing over to her and indicating outside. Coming over to stand next to him, Addison seen the police car outside and felt the adrenaline start to run through her: something strange must have come up if Lestrade had come straight to Sherlock.

Hearing the sound of someone running up the stairs, Addison looked behind her to see Lestrade enter the room, slightly out of breath. "Where?" Sherlock asked immediately.

"Brixton, Lauriston Gardens," Lestrade answered before giving Addison a small nod, "should have guessed you'd be here."

Sherlock put his hands in his pockets and gave Lestrade a serious look, "What's new about this one? You wouldn't have come to get me if it wasn't something different."

"You know how they never leave notes?"

"Yeah."

"This one did. Will you come?"

Sherlock thought for a moment, "Who's on Forensics?"

"It's Anderson."

Making a face, Sherlock looked annoyed "Anderson won't work with me."

"He probably would if you didn't constantly insult him and being such an arse," Addison pointed out, "do you really need an assistant?"

Sherlock sighed, "I do really need an assistant, you know that."

"We'll sort that out when we get there, Addie can do it if you need one so bad," Lestrade said, shooting her an apologetic look, "Will you come?"

"Not in a police car, I'll be right behind."

Lestrade looked relieved and nodded, "Thank you. You coming with him or me?" he directed the question at Addison who was already picking up her bag and doing up her coat.

"I'll come with you," Addison seen the slight annoyance in Sherlock's eyes and smiled at him, "I'll see you there. Nice to meet you Dr. Watson, I'll come see you another time Mrs. Hudson."

"Goodbye dear, keep safe," Mrs. Hudson said, looking slightly worried about her while John gave her a friendly wave.

Heading downstairs to the car, Addison glanced at Lestrade, "Let me guess the others don't know he's coming?" she asked as he held open the front door.

"No, they're not going to like it but I'm desperate to get some answers," Lestrade said tiredly as they got in the back of the police car and it drove off, "and right now Sherlock's the man to get them for me."

Addison smiled and patted his arm, "Don't let him hear you saying that. He's got a big enough head already."