Series 1

Sam's (John Simm) belief in doing the right thing calls into question the ethos of his whole department.

Gene (Philip Glenister) believes that local gangster Stephen Warren and the police can co-exist and that the streets are safer as a result. Coming from 2006 Sam knows that in the future police corruption will irrevocably change the relationship between the public and the police. This knowledge that makes him determined not to turn a blind eye. But he knows that to get to Warren he needs Gene onside.

But does Sam realise the full consequences of taking on someone like Warren? And can Gene come round by laying to rest a ghost from his past?

As Sam sets to work on Gene, Warren sets to work on Sam. Sam comes face to face with his mum and discovers that she has money worries. With best intentions, he offers her the 'hush' money given to him by Warren. His mother is deeply offended.

Appalled with what he's just done, Sam seeks out Warren and returns the money. But Warren isn't about to allow Sam to put an end to his 'cordial' relationship with the police and sets out to get Sam.

The full consequence of taking on someone like Warren hits home for Sam when a young woman gets caught in the crossfire.

There's no going back for Sam now, he has to nail Warren. Sam discovers that Gene's reluctance to deal with Warren stems from an incident way back in Gene's past. He realises that he'll never succeed in taking Warren out until Gene lays his ghost to rest.

Eventually he gets Gene on side. Using some 70s style policing they get one of Warren's employees to reveal that Warren's guilty of murder, before finally arresting the gangster.