When the tortured body of a young woman is found in a dumpster, her eyes swollen shut and her clothes soaked with blood, Detective Erika Foster is one of the first at the crime scene. The trouble is, this time, it's not her case. While she fights to secure her place on the investigation team, Erika can't help but get involved and quickly finds a link to the unsolved murder of a woman four months earlier.

When Detective Erika Foster finds politician Neville Lomas naked, hog-tied, and dead in his own bed, skittish higher-ups at the Met quickly rule the death from natural causes. Case closed - until two months later when a well-known casting director and a star footballer are found murdered and tied with the same knots. The Met can no longer ignore what's staring them in the face: there's a serial killer loose in London, and they're out to settle a score....