When a body is discovered in a quarry, DI Karen Pirie and her team are tasked with reopening the case of the infamous 1984 kidnapping of an heiress and her son.

The team are closer than ever to the truth as Karen digs into Cat's life and disappearance, but a shock discovery changes the course of the investigation.

The case takes a dramatic turn and the pressure from all sides increases as Karen races to track down those responsible for the kidnap before the truth is buried.