AN.: Okey, so this will be a Sherlock/OC fanfiction. But not in the usual way. This will not be a continuous story, only life segments of Serena and Sherlock. As chapters go on, you will see more and more. But my goal is, to work your imagination and make you to fill in the „gaps". From time to time I will ask for your vote to decide which part of their life should be written down next.

Summary: Serena S. Lestrade, is the best criminal psychologist with high intelligence. Her brother Greg asks her to work in London Scotland Yard. She has a dark past. They meet with Sherlock during a case, and while they work together and getting to know each other, it seems she will be the biggest puzzler for Sherlock in his life. Then everything starts to change.

I don't own anything, only my little Serena.

Have a nice reading. J

Prologue

Serena got off the plane with some excitement. She had not been in England since.. Well that day. Flee, hide was much easier 5 years ago. As these thought came into her mind, she felt sadness and goosebumps run down on her back. She looked around and watch the people, all looked like normal tourist with suitcases going separate directions. Some nervous for work, some happy to be home, some just bored.

She smiled at herself. She can read people so easily and she cannot read, or understand her own feelings of retuning. "Shame.." Slowly she made her way to the luggage pick-up terminal. After 10 minutes she found hers, turned to the exit and with a heavy sigh started to walk outside.

- Welcome back in life Serena! – she mumbled with some uneasiness.

Each step took her closer to the streets of London. As she reached the door, it opened automatically letting in the cool wet English air. She stopped, closed her eyes and waited patiently for something; some sign or miracle which tell her if this decision was right or wrong.

As she stood there lots of people watched with curious eyes the attractive woman with tight closed eyes. She was 1.65 cm height with a slim form. To be precise she was 55 kg. She didn't have big breaths but everybody could say she had every needed famine attributes. Her hair was curly red as the setting sun. Her eyes were deep brown similar to the rich soil.

When she got consciousness she quickly raised her hand to pick up a taxi.

- Taxi! – she shouted. Immediately a black cab stopped. The driver was very helpful, and put her bags in the car.

- Where to, Miss?

- The Yard please, I have a meeting with my brother. – she smiled and silently checked every detail in the cab. When she started to memorize the cabbie's ID card number and analyze him mentally she slapped herself.

„Oh my, will I do this with every man I get across? I should switch off my mind sometimes."

The drive to the Yard took for 20 minutes. She was staring out of the window not saying a word all way. She subconsciously saved every street every road every building in her mind. They arrived at Scotland Yard, she paid the bill and started to walk into the building.

She wondered what will her brother say if he realize her in her office. NO way he will be pleased. But she liked Greg's face when he was annoyed with her. It was funny anyway. That was the fact why she choose an earlier plane, and came here alone. She was sure her brother would send a full police convoy to the airport to get her here. No need to be observed.

As she walked into the building she went to the cafe machine, pretending to buy some liquid she observed the place and looked for any sign where Greg's office would be.

„Easier than I thought." – she smiled.

When she got all the information she needed, she launched herself to the nearest staircase and walked 2 floors. Then turned left and the only barrier between her and the office was a closed glass door. If she can get though without looking too suspicious no one will ask who is she. All they would think, we have a new college. Just need a plan.

She went to the kitchen and waited. Few minutes later a cop dressed in a white T-shirt and blue trousers with the name tag „Anderson" appeared with a cup of coffee. She launched herself and colloided the the man spilling the coffee all over both of them.

- Oh am really sorry Mr… Anderson. I didn't look where I step. – then dramatically watch over her ruined clothing – it seems I have to change. Fortunate that I brought some change with me.

Anderson watch with wide eyes who is the new woman who seemed to now him. But he couldn't recall anything about her.

- Sorry have me met before? – he asked confused.

- You're very funny Anderson. It's me the new college from the forensic group. We just met yesterday evening on the scene. You really don't remember, do you? – she said and put a bit of hurt into her voice.

- Of course I remember…

- Luna. Luna Snape. – she helped him out.

- Luna, yes that's is. Sorry, I'm a bit tired. – Serena smiled at the naive man, so easy to manipulate them. She continued.

- Look I'm quite new here and left my ID card in the office, could you lend me yours, I would pick up my other up wear. I'll be back in a second. – she cooed, fluttered her eyelashes and stepped closer to Anderson. The movement made it's propose.

- Sure. Take it. I'm just going and get another coffee so I won't need it for at least 20 minutes.

And with that he handed the card into her hand. "Victory!" She went to the door and pushed the card to the consol, the door opened immediately without any problem. She stalked in directly to her brothers office. As she opened the door with a big smile on her mouth it turned out Greg was not there. The office was totally empty. She started to giggle, it was much better than she thought first. She loved to put his brother into situations which was coming.

45 minutes later the alarm rang. Officers jumped from their seats and started to run arourd like chickens. Serena saw Anderson inside, so after 45 minutes the genius realized he just gave his entry card to someone he probably should not. "Cute. Slow as a snail."

5 more minutes passed when the office door opened and revealed a very furious Greg Lastrade. He looked the his sister sitting in his chair smiling ear to ear and tried to decide how to act. Throw her out shout at her or greet her. Finally he pushed his head out of the door shouted a few command to calm people down and then addressed the woman.

- I'm glad you having fun sister. Good to see you again. – When he spoke his eyes hold the warm brotherly love he always had for her little sister.

- I missed you! It's a pleasure to be here again brother. – she stranded and walked to Greg and hugged him warmly.

They only parted when Serena saw a very confused looking Anderson on the other side of the window. There was pure shock on his face.

- Amm, Greg I think you should give it back to Anderson. He's looking for this. – she grinned and gave the card to the officer.

- You made quite a big anarchy in here Sisi. Are you enjoying yourself?

- Oh yes brother. You don't know how much.

AN: So this is the prologue. Next time Serena and Mr. Holmes will finally meet.