Series 1

When small time drug dealer, Billy Kemble dies in police custody, Sam (John Simm) is pitted against the whole of CID. His suspicions that the details of the death are being covered up by the unit make him very unpopular. Even more so when he tries to uncover the truth of what really happened in the cells.

Sam demands a transparent investigation into Billy's death. Coming from 2006, he knows that if the Police don't police themselves the public will never trust them. Gene, on the other hand, has different ideas. He believes that Billy died as a result of being beaten up by his cellmate, case closed.

However, when the pathologist's report arrives it shows that Billy's death was caused by a cocaine overdose. Gene is ecstatic - the Police are in the clear. But Sam is still not convinced, something he knows about drugs from his 2006 briefings but can't quite put his finger on.

As Sam starts questioning his colleagues he discovers that none of his team are telling the truth about Billy's death - not even those he thought he could trust. He discovers that Ray (Dean Andrews) forced Billy to take cocaine, not realising he was only a dealer not a user. Because Billy had a weak heart, the cocaine killed him. Annie (Liz White), Chris (Marshall Lancaster) and Phyllis (Noreen Kershaw) all helped cover the incident up.

Sam realises that this could be the opportunity he has been waiting for. The revelations could destroy this world and all the people in it, thus propelling him back to 2006. Despite Annie's pleading, he goes ahead and presents the evidence to the Chief Superintendent. But the Super destroys it, happy that Gene's decision to demote Ray is the end of the matter. Meanwhile, Sam's left wondering if he'll ever escape 1973.