The mystery deepens as Jack gets closer to finding the other missing boy.

Gina's life is put in danger when an attempt to lure the killer takes a deadly twist.

The travelling fair comes to town, and WPC Dawson searches for a runaway girl.

Max and Fenton investigate a flood of counterfeit notes, and Lenny shows his true colours.

An undercover operation threatens to expose a secret that could ruin Inspector Briggs.

Coulson decides to Briggs’ misfortune to reassert his power at the police station. DI Sawyer questions a suspect with a shocking wartime story to tell.

A tragic event leaves the the team having to decide where their loyalties lie. Time is running out for Annie and DI Sawyer as they find it hard to unlock the dark secrets of the Petra Project.