International and New York Times bestseller Deborah Crombie returns with her beloved Scotland Yard detectives Duncan Kincaid and Gemma James in a compelling new crime novel as they race to solve the shocking murder of a young woman before panic spreads across London. Junior doctor Sasha Johnson hurries through a rainy November evening crowd in London's historic Russell Square. Out of the darkness, a stranger brushes roughly past her. A moment later, Sasha stumbles, then collapses. Nearby, Detective Superintendent Duncan Kincaid and his sergeant, Doug Cullen, are called to the scene, and quickly discover that she's been stabbed. Kincaid immediately calls in his wife, D.I. Gemma James, who has currently assigned to a special task force investigating knife crimes which are on the rise. Along with her partner, Detective Sergeant Melody Talbot, Gemma joins in the investigation. But Sasha Johnson doesn’t fit the usual profile of their typical knife-crime victim. Sasha is single, successful, career-driven, and has no history of abusive relationships or any gang links. Sasha did have secrets, though, and some of them lead the detectives uncomfortably close to home. Even as the team unravels the Sasha's tangled connections, another, related murder intensifies the hunt and the consequences. Kincaid, Gemma, and their colleagues find that even their closest friendships may be at risk if they are to find the killer stalking the dark streets of Bloomsbury.