DI Kat Donovan, eleven years after her fianc‚ Josh vanished, she finds his profile on a dating app, forcing her to confront his disappearance, her father's unsolved murder, and a wider criminal conspiracy.

The Reappearance: Kat (Rosalind Eleazar) works in the missing persons unit but is shaken when Josh (Ashley Walters) appears on a dating app, leading her into a dangerous investigation.
Uncovering the Past: The investigation links to the 11-year-old murder of her father, a police officer who was secretly involved in a blackmail scheme.
Conspiracy: Josh is connected to a crime syndicate that kidnaps wealthy singles and, in a twist, was involved in the death of Kat's father, which was originally covered up.