DI Alex Drake is a high-flying police psychologist who finds herself thrust back in time after being shot by drug-addled Arthur Layton.

Alex opens her eyes to find herself in a drugs bust in 1981, dressed like a prostitute and part of the fantasy world imagined by Sam Tyler, the DCI she had been studying.

DCI Gene Hunt, DC Chris Skelton and DS Ray Carling arrive with all guns blazing. They accuse yuppie Edward Markham of being behind the crime, but Alex is convinced that the young Layton is the mastermind behind it.

Catching Layton might be the only way for Alex to grab control of her destiny. Will it be the trigger that gets her out of this fantasy, back to her old life and her daughter Molly?