Alex soon realises she has not returned home after all, and wakes up in 1983. Gene is on the run, and DCI Jim Keats has arrived from Complaints to investigate CID following the shooting. Newly-promoted DI Ray Carling leads an investigation into the kidnapping of a young girl, and sets up a sting operation. Alex decides that she will have to discover the truth about Gene if she is ever to get back to her own time.

A severed hand is sent to Fenchurch station. Discovering that several women have been murdered, Alex decides to join the dating agency they all used. Alex tries to discover the truth about Sam Tyler's death, but Gene is obstructive.

DCI Jim Keats has almost finished his report into DCI Gene Hunt and his team, but he's still pushing DI Alex Drake to find out what really happened to Sam Tyler.

When reports come in of a disturbance at an ANC illegal drinking den Gene heads in all guns blazing. The men at the club are quick to dismiss the disturbance as nothing, but when DI Ray Carling spots blood on the floor and discovers a dead body, it leads Gene into a murder investigation.

DCI Gene Hunt and his team are investigating a diamond heist following the murder of three London gang members. But DI Alex Drake is distracted and, with encouragement from DCI Jim Keats, she decides to pursue her own investigation to the bitter end - did Gene Hunt murder Sam Tyler?

When Gene discovers that Alex has gone, he races after her leaving Ray Carling, Chris Skelton and Shaz Granger to plan an ambitious sting operation.

As Gene desperately tries to reach Alex before she discovers the truth, Chris, Shaz and Ray's world completely falls apart. It's time for Alex and the rest of the team to find out the truth about Gene Hunt...