When two bodies are found brutally murdered on a building site in Battersea, Detective Sergeant Calil Drake is first on the scene. He sees an opportunity: to solve a high-profile case, and to repair his reputation after a botched undercover operation almost ended his promising career in the Violent Crimes Unit. Assigned to work with the enigmatic forensic psychologist Dr Rayhana Crane, and on the hunt for an elusive killer, Drake's investigations lead down the dark corridors of the past—to their military service in Iraq and the destruction they witnessed there. With a community poised on the brink of violence and their lives on the line, Crane and Drake must work together to stop the killer before vengeance is unleashed.