There's a psycho out there. He's murdering a young woman every Tuesday, killing in gruesome ways inspired by the movies of Alfred Hitchcock. Forced on a fast-track scheme for ethnic minority officers, Josa Jilani has been rocketed to Detective Superintendent with the London Met. But someone high up wants her to fail and she's made senior investigating officer in the hunt for the serial killer. Out of her depth, scared and with her reputation and livelihood on the line, she's determined to stop the murders and make her dad proud. She has a week to catch a killer.