If... Then...? || Sherlock BBC

Prologue

The weather above London was grey as always and the city was about to fall back into a night. The street lamps had already turned on, casting many shadows on the pavement. Sherlock was looking out the window while playing violin. Lost in his thoughts, he was looking down of the Baker Street and it's pedestrians, which number was decreasing with each minute. Baker Street was slowly getting ready to sleep. But not Sherlock. He was busy. John was sitting in his chair reading a book while listening to Sherlock's music. It matched the book surprisingly well. They didn't have peaceful evenings like this. Usually they both would be running around the city in order to catch a criminal. However, this evening was different and John Watson had not even thought about questioning it. Sherlock suddenly stopped playing which caught John's attention.
— What's up? — he asked. Sherlock carefully put down his violin.
— Have you seen the news? — Sherlock asked John.
— Not much. A new case?
— Well, you couldn't really call it the news. It was only one article. A disappointingly short one. — he frowned and dropped onto his chair— A woman named Evelyn Laurier caused a lot of controversy in psychological field. She analyses facial expressions in criminal background to detect lying or habits and style of lives.
— That sounds interesting. Similar to what you do. — Watson took a sip of his tea.
— She calls them "microexpressions", a small movement of muscles but mainly facial muscles which can be detected with a special camera. However, Ms. Laurier didn't need one to determine what she saw. — John put his tea down and started listening more carefully. — Her employers and coworkers demanded from her to teach the technique to the rest of the team. Not a single person managed to understand it or learn it successfully. So they accused her of lying which was quickly proven wrong.
— And then? — John was intrigued by the story.
— Then she quit.
— Quit? Just like that?
— Yes. Every information the journalist got was from her coworkers, not a single one from her. I assume she quit because of them.
— Mobbing?
— Possibly — Sherlock deeply inhaled which John immediately noticed.
— So what's so interesting?
— What? — Holmes asked like woken up from a trans.
— Why did this article catch your attention?
— Isn't it obvious? — he asked in disbelief but quickly continued when he saw no response on his friend's face. — A phenomenal psychologists with unique ideas is asked to demonstrate her theory. Nobody on her team can perform it, people accuse her of lying, which is then quickly diminished by her accuracy. Instead, they got jealous of her uniqueness and started hating her, including her employers. So she quit before the matter got out of hands. No one heard from her since. She left for a reason. She left because she didn't want this information to reach a bigger publicity. However, the journalist got this information out of her ex-coworkers, spreading the theory. She didn't quit. She's trying to hide.
— Indeed interesting.... So what now? — asked John.
— We wait for a client. — said Sherlock and closed his eyes to think. From then on the room was filled with silence for the rest of the night.