Human (BBC Sherlock)

Isabelle is a long-time friend of John Watson who has decided to start a new life in London, moving into a flat shared with both John and the world's only consulting detective, Sherlock Holmes. She's intelligent and witty, but is shy and unconfident, and on top of that holds secrets of her dark past that even Sherlock can't deduce straight away, much to his annoyance.
As Isabelle learns to adjust to the not-so-normal life that comes with living with Sherlock and John while working to head out on her own, her past comes back to haunt her in a way that sends the mystery-solving duo into a new challenge, and Isabelle into a struggle to avoid yet another downward spiral. However, she soon finds that the only person who can save her from herself isn't necessarily the one that she expects.

*cover credit to shockholmes.tumblr.com*