DI Alex Drake is taken hostage and shot, and wakes up in a brothel... in 1981. Rescued in a police raid, she quickly recognises DCI Gene Hunt and his team from detailed reports made by DCI Sam Tyler about his own trip to 1973.

Gene is determined to address London's growing drugs problem, and has targeted city playboy Edward Markham as the brains behind the operation. Alex suspects Arthur Layton, the man who kidnapped her in 2008. Could Layton be the key to her return to her own time?

DCI Hunt is determined to keep a lid on protests against the London Docklands development. When a suspected member of the London Liberation Front is arrested, Alex asks her mother, a lawyer, to defend him. Meanwhile, Prince Charles is marrying Lady Diana Spencer and the in-crowd is partying at the Blitz Club.

Fresh from a successful drugs bust, Gene and the team investigate a prostitute's rape allegation. A dangerous serial attacker may be at large, but the case is hampered by an unreliable witness and the suspect's connections.

CID investigate a murder, and discover a plot to sell stolen nuclear secrets to the Revolutionary Workers Front. When Gene and Alex get trapped in a secret Government facility at Edgehampton, the temperature rises.

Gene and Alex discover that a notorious pimp and drug dealer has a major firearms deal in the pipeline. In an attempt to locate him, the team go undercover in a gay club, and Ray goes beyond the call of duty to get his man.

An armed robbery leads Gene to Chas Cale, a criminal he tried to bring down in Manchester. But when Chas reveals his alibi, Gene begins to wonder if he is past his prime as a DCI. Alex sends Ray and Chris undercover at the local pub in order to solve the case.

The team investigates the armed robbery of a fundraiser who has been travelling across the country in a bathtub full of baked beans to raise money for Children in Need. Alex thinks that a crime reconstruction on Police Five will do the trick, but Gene prefers some old-fashioned police work.

Alex is determined to prevent the murder of her parents in a car bomb attack. Gene, meanwhile, is determined to give a good impression to a visiting Lord Scarman, but the station is still dealing with the aftermath of a Gay Pride demonstration.

When a dead man is found in a Soho strip club, it looks like a sex game has gone wrong. So when the deceased is discovered to be a police officer, Gene and Alex are ordered to keep the case under wraps.

The team is on the hunt for major vehicle thief Jed Wicklow, but when a car chase leads to his death, Gene stands accused of causing it through reckless driving.

Alex is adamant that there was something wrong with Jed at the wheel and wants to prove that the crash wasn't Gene's fault. The deceased Jed was a Romany gypsy, and hostilities run high on the camp as CID heavy-handedly try to uncover the circumstances of his death. But in an investigation that's already met with resistance, someone in the police force also appears to be standing in their way.

Animal rights activists have threatened a series of attacks in London and the first victim, the daughter of a commercial laboratory owner, is in hospital. Gene orders his team not to sleep until those responsible are behind bars.

Their first stop is a prison where Robin Elliot, a known animal rights campaigner, is serving time for killing a scientist in the 1970s. Alex is convinced that Robin knows about the planned attacks, but with no contact with the outside world, there doesn't appear to be any way for him to be involved. Robin's eerily prescient knowledge of the future makes Alex think that he could be involved not only with the case, but with her own fate; having heard the voices of ambulancemen, Alex worries that hope is fading for her survival in the present day.

A face from Gene's old stomping ground of Manchester shows up called Jackie Queen. Jackie is a reporter who is investigating teenagers who traveled to London from the north and have disappeared.

When a violent burglary occurs at Alex's in-laws' house, she comes face-to-face with their son Peter, the 14-year-old future father of Molly! Alex is desperate to help Molly's grandparents all she can, but Gene wants a big collar to bury the press stories of police corruption, and dismisses the case as trivial.

When the fingerprints from the crime scene reveal the burglar was George Staines, a notorious gangster, now supposedly dead, Gene realises this could be the catch he was after. Alex remembers hearing stories about the burglary, and is convinced that she would remember if the culprit was as infamous as Staines. Gene is determined to uncover the truth and get the headline he deserves.

Alex finally meets the mysterious man who has been leaving roses in her apartment and office. He tells her that she can go home to see her daughter again, but involves her becoming corrupt.

After a dead body is found in the canal it is identified as Colin Mitchell. Alex is certain that the dead man's wife Donna is not telling everything and she is determined to uncover the truth. Back in 2008, Alex has surgery to remove the bullet from her brain.

CID find a body buried in concrete as they investigate a drugs drop at a building site. Alex thinks she is getting better and will soon wake up in her own time. Working on the case though starts to clash with her wish to be back home.

After Alex catches an infection back in 2008, she knows the doctors think she wont pull through. Distance grows between Alex and Gene and their relationship is put under the greatest strain yet.