The Reckoning

Six more victims are brutally murdered across London, including one victim previously undiscovered, and DCI Red Metcalfe has little to no leads. As he and the team try to protect any possible targets from the killer, forensic examination of a hair sample found on the one of the victims lead Red to believe that DI Duncan Warren is responsible for the murders, unaware the hair sample had been planted by the killer. With Warren in custody and a formal statement having been made about his arrest, Metcalfe goes to see his brother Eric, who has been sent an anonymous letter about his brother. Red then realises that Duncan is not the killer, but before he can tell anyone, is confronted by the real killer in his flat.