Chapter One

Cassidy Scott sat and watched as the cab weaved its way in and out of traffic. Her stomach was in knots. She had left London eight years ago without looking back and she had been certain back then that she would never return to her homeland. Up until a week ago she stood firmly with that believe but things had spiraled as they usually did and she had been forced to board a plane back home.

Not that she really had a home. She had an older, obnoxious and selfish sister but that wasn't home. No parents, no house with memories of her childhood or specially baked treats waiting for her. Growing up in London she had always seen it as a magical place, old Victorian buildings,and the smell of rain hitting on the tarmac, the shades of different grey hues and the luscious greens of the country side. But now sitting in a cab she viewed her former grounds with distaste. It's true what the world thought about London; it was gloomy and dull.

Looking back she preferred New York, her home for the last eight years. Cassidy pulled out her mobile and sighed, her clock was still set for New York. She quickly changed the settings before glancing at her gallery. She only had two photos on her phone, one of Sam and his family and the other of the threat she had been sent. A doll with a severed head, with the words "We're coming" etched in what she assumed was blood on the doll's dress.

Cassidy grumbled and tucked the phone back into her jean pocket. Being a criminal profiler and working for the CIA had its risks. It hadn't been her first threat. She worked under detective Sam Edwards for four years, and in that time the two of them had cleaned up the streets effectively enough that people began to take notice of them. Especially the criminal masterminds. But this threat had been different. Sam was like her father, he'd been the one to hire her straight out of school, invited her into his home with his wife Sandra and their two kids.

A serial killer by the name of The Splitter, had threatened the CIA when they started chasing down leads to his organization. With the help of Sam and Cassidy the CIA were able to learn that The Splitter was none other than, Antonio Diaz a Spanish mobster with connections to underground links, who was posing as the splitter. However there was no sufficient evidence to support that Antonio was The Splitter as he claimed to have an organization behind him that supplied assassins to him. Antonio got bail and vanished months before his trial. In that time frame they had discovered that Antonio's wife was behind a number of murders as well, but the minute Sam and Cassidy dug the threats came. Dismembered fingers were sent to their office, and an expose was threated to be leaked of the CIA to a news agency on all their agents and then came the threat on Sam's family.

They had gone for his children, stalking his children until eventually kidnapping them got their message across to them. Their orders were clear and precise. Sam's children were returned back to him unharmed with the condition they leave the C.I.A for good. Cassidy had been reluctant to leave but Sam had convinced her to leave.

"Cass you got to do this. I wouldn't be able to live with myself if something happened to you. They got to Justin and Francine. They were followed by agents Cass when those threats came in. They won't stop until we both stop. Go home, Cass go back to London. You'll be safer there. You can figure out the case that you and I both know you want to figure out. It's not possible here Cass, it's safer for us to leave." Sam had said as he gripped her shoulders trying to shake sense into her.

Sam had booked her a ticket and the next day she resigned from the CIA and left for London. Cassidy didn't like being threated but she knew that as long as Antonio was out there, she wouldn't be able to return to New York. Sam and she had gathered that there was something bigger going on, bigger than the Splitter. An organization of sorts that was helping criminals with their issues. But what could she do now? She was on the other side of the world and being forced to play by her sisters rules.

Jane wasn't pleased that Cassidy would be arriving to London, but she had offered to put a roof over Cassidy's head and provide her with a job at their parent's bookstore.

Cassidy sighed as the cab came to a stop. She blinked her eyes and frowned. The trip from the airport to Barnes, where her sister lived had flashed so quickly that Cassidy hadn't even had time to prepare for what she was going to say or do when she saw her sister. Cassidy paid the cab driver and collected her bags and frowned. Leave it to her sister to have the big and expensive house. She walked up towards the front door and knocked but as she knocked the door swung wide open.

Cassidy went immediately into alert. Why would her sister leave the door open? Cassidy frowned and glanced behind her. She noticed two cars down along the street, a sleek black Mercedes was parked. Cassidy dropped her bags and made her way towards the Mercedes. No one was in the car but she pulled on the handle of the passenger side door and it swung open. Someone was in a hurry and had left their very expensive vehicle unlocked.

Cassidy strode into her sister's house and called out for her sister. But there was no answer. Cassidy frowned and wished Sam was with her. At least he carried a gun. Adrenalin coursing through her veins Cassidy heard the sounds of footsteps upstairs. Without thinking she climbed the stairs and made her way down the passage. She could only hear a muffled female's voice and a loud clunking noise. Her sister was in danger. Cassidy looked around her for anything to use as a weapon. She moved back down along the passage and opened another door, it was her nephew's room. Cassidy grabbed a hockey stick that lay on the floor and made her way back to the door where she could hear muffled noises.

"Okay you can do this, Cass." She thought to herself as she swung the door open, hockey stick raised to fend off any attackers.

But the minute Cass stepped through the door, she wished there had been attackers. Jane was sprawled on the bed, tied up and mouth bound, with an equally sweaty man on top of her. She wasn't in danger, she was clearly enjoying it. The man on top stopped his ministrations and turned around towards Cassidy. The man definitely wasn't Jane's husband, Richard. Cassidy watched as her sister recognized her and immediately Cassidy could see in her sisters jade eyes that she was annoyed. Jane gestured towards her lover to remove the bound before shoving him off and reaching for her robe.

"What the fuck Cassidy! Haven't you ever heard of knocking?" Jane shouted.

Cassidy dropped the hockey stick and crossed her arms in defense. She hadn't planned on her encounter with her older sister being this awkward.

"Your door was unlocked. I thought you were in trouble." Cass frowned as Jane's lover walked stark naked passed her towards the ensuite. "But clearly you're not. How's Richard doing?" Cassidy spat out sarcastically.

Jane huffed and pushed her blonde hair to one side.

"Don't start. I don't ask questions about your nonexistent sex life." Jane growled out.

Cassidy and Jane just stared at each other. Neither one wanting to say hello. Cassidy analyzed her sister in front of her. Jane definitely had a boob job since she last saw her, her body was thin and lean no doubt from all the spinning classes she attended and her face didn't have a wrinkle on it. Botox no doubt. Cassidy was aware that her sister was probably also searching her up and down.

Unlike Jane, Cassidy had a much fuller figure, big hips and she had been cursed with a very good pair of assets as opposed to Jane. Cassidy wasn't tall like Jane, she was short and detested wearing high heels. She had dark brown auburn hair that fell to her shoulders in loose curls, while Jane had a sleek blonde bob that was sleek and straight. Where Jane had a natural tanned skin, Cassidy was pale and with her dark hair, she looked even paler than she really was.

Jane sighed out suddenly and glanced at her wrist watch. Cassidy watched as her sisters eyes widened in shock.

"Oh my god I forgot about Arthur." Jane shrieked as she began pacing.

Arthur was Jane and Richards's only child. Cassidy's nephew. He was six years old and according to Richards emails he sent to Cassidy on occasion, he was a typical boisterous six year old.

"You have to go and fetch him." Jane rounded on Cassidy her face flustered.

"What?!" Cassidy asked confused.

"He's at school and he needs to go to the doctor. I forgot completely about it."

Cassidy smirked.

"Yeah your brains were getting banged. It's kinda easy to see how you could forget to pick up your son and take him to the doctor." Cassidy said sarcastically.

"Go fetch him. My car has gps. I'm sure London hasn't changed that much since you left." Jane said oblivious to Cassidy's sarcasm.

"Why do I have to go?" Cassidy growled out.

"Because idiot I have to get Tim out the house before Richard gets back. I was supposed to take Arthur yesterday and he was mad because I went to the spa instead." Jane sighed, and reached into her jacket pocket that lay on the floor along with her other clothes. She pulled out a set of car keys.

"Take the Jag and fetch him." Jane huffed before turning on her heel and heading off towards the ensuite.

Cassidy sighed. She was really going to have to find a place of her own.

Sherlock was bored. He was always bored but this time it was getting worse. John and Mary had welcomed their daughter six months ago. Amelia Sheryl Watson. He had been happy for his friend but it meant that John was no longer available to him when he needed him. Babies always changed everything he thought, tempted to take the gun out the desk draw and start firing away at the bloody smiley face on his wall.

It was absurd. Not a case over a seven for nearly two weeks. What the hell was he supposed to do till then? Sit and play with Amelia and try discover if baby babbling was indeed another language entirely.

"I need a smoke." He thought to himself as he stretched out from the couch. He just needed to know where to find his hidden stash of cigarettes was. Just one was all he needed he told himself. He stood up and swept around the lounge area, his blue robes billowing behind him.

At that moment, Mrs. Hudson appeared brandishing his usual cup of tea in the morning. She looked shocked to see him awake.

"You're up early this morning?" She tutted as she took in the state of the lounge.

Sherlock mumbled and continued his search.

"No cases I suspect?" Mrs. Hudson sighed as she tried to clean some of the mess he left on her kitchen counter.

"Very good deduction skills, Mrs. Hudson perhaps you are intelligent." He replied sarcastically lifting one of the sofa chairs up.

Mrs. Hudson ignored the quip.

"Perhaps you should get a roommate, Sherlock. Someone nice who can go with you on your cases. Now that John and Mary are looking after a baby."

Sherlock dropped the chair, loudly onto the wooden floor. A sudden thought popping into his head. Perhaps the old bag was right. Maybe he needed another John, not that there would ever be a replacement for John but an apprentice of sorts to act as a stand in if John was unavailable to offer him assistance on a case.

It was a marvelous idea. He made his way over to Mrs. Hudson and swooped his arms around her in a hug.

"Bless the dull minds of the earth, they make mine run so much smoother." He smiled forgetting all about his cigarettes.

He placed Mrs. Hudson back on the floor, beaming from ear to ear. Mrs. Hudson was suddenly fearful of him. That look meant he was up to something.

"Call John, Mrs. Hudson. Tell him I want a new roommate before the day has set." Sherlock said walking towards the window.

"Okay dear, but I'm not your housekeeper." She smiled before leaving.

'Oh yes, an east wing was coming. He could feel it.'

"He wants what?" Mary asked alarmed as she cradled Amelia in her arms.

"You heard me, he wants a bloody roommate and by today no less." John sighed pinching his nose.

Mary placed Amelia into her pram. Luckily for her she didn't have to give up work or motherhood. John being the main GP helped, she was able to bring Amelia with to the reception room where she could keep an eye out on her. Mary had wondered when Sherlock was going to realize that with a baby it left to very tired adults who weren't too keen to go off gallivanting in the night.

"Maybe it's not a bad idea, John." Mary sighed. "He needs the company."

John shook his head and pushed his half eaten sandwich away from his desk.

"This is bloody, Sherlock Holmes were talking about Mary. Who the hell is going to be able to put up with him?"

"A special person. Just like you. Now don't worry, I'll figure it out. It's the least I could do for Sherlock after …" Mary trailed off.

She didn't like talking about the creep Magnusson and she didn't like talking about the fact that she had almost killed Sherlock.

John understood and nodded. He stood up from his chair and placed a kiss on Mary's cheek and a small peck on Amelia's little tuff of blonde hair.

"My two girls, where would I be without you two?" He smiled.

Mary didn't know how she was going to find someone to stay with Sherlock, but as she walked out into the reception room she saw somebody from her past walk in.

Cassidy Scott.

An: Okay so this is my first Sherlock Fanfic , so go easy on me hehe. Chapter two will be put up within the next two weeks and from then on I will update weekly with a chapter.

CC