Code 404 follows two top crime-fighting detectives, DI John Major (Mays) and DI Roy Carver (Graham).

An undercover sting goes horribly wrong when John is shot and killed, so Roy, plagued with guilt and regret towards his colleague’s death, seeks solace from the only person who understands him. This person just happens to be John’s recently widowed wife Kelly, played by Anna Maxwell Martin (Motherland).

However, when John’s body is chosen as the prototype for a new A.I. driven police initiative, DI Major returns from the dead…much to the surprise of Roy and Kelly.

While John is certain that he has rebooted into his best ever self, the others notice that something isn’t quite right…

All episodes of Code 404 will air on Sky One and NOW TV from Wednesday 29th April.