Taverner is desperate to hide dangerous secrets. River seeks answers at his grandfather’s house.

Lamb questions David about France as River comes face to face with the enemy.

A naive agent makes a discovery about the Westacres bomber. Lamb suspects that David knows more than he’s letting on.

River is trapped in France. Back at Slough House, the Dogs have come for Lamb.

The chalk-and-cheese detective duo are called to a private clinic where a wealthy patient has been killed. However, their investigation is made all the more difficult by the complex relationships…

Carey teams up with Shaun Emery to try and expose Correction, but Napier is one step ahead. Shaun’s future, and that of the nation’s system of justice, lie with one…

Carey develops a theory as answers begin to reveal themselves, and Shaun finds himself trusting an enigmatic stranger who promises to lead him to the truth.

Surrounded by the architects of his downfall, the truth behind what happened to Shaun is revealed to him in precise detail. Meanwhile, Carey seeks for answers of her own and…

Father Brown’s divine inspiration is called upon when Kembleford comes under threat of an alien invasion.

Architect Mia scrambles to keep a dark secret under wraps, while insurance investigator Shazia harvests people’s memories of a nearby accident scene.