When one of her closest friend's life is put on the line, Lydia Evans is tasked with anonymously delivering a necklace to the great Sherlock Holmes through her connection with his flatmate, John Watson. However, things take a turn for the worst and Sherlock is forced to investigate John's former friend after realising there's more to her than meets the eye. Based on the BBC Sherlock series, semi-canonical. There will be occasional scenes from the show, but the majority will be original. Set after Hound of Baskerville.