Sofia Harding is the new Chief Inspector. Fresh-faced and young, she is expected to breathe new life into the police force after the retirement of Greg Lestrade, but a chilling murder by a psychopath leaving a trail of bloody clues gives her no choice but to ask from help. And who better to ask than Consultant Detective Sherlock Holmes? Soon they are thrown into a dangerous web of lies, secrets and violence which causes them to question everything they know, including their ability to love and be loved. As darkness closes around them, it is only Sofia and Sherlock who can find the light.