Season 4
6 episodes
Episode 1
A London bombing puts Taverner under pressure. When River grows concerned for his grandfather, Louisa encourages him to go for a visit.
Episode 2
A naive agent makes a discovery about the Westacres bomber. Lamb suspects that David knows more than he's letting on.
Episode 3
River is trapped in France. Back at Slough House, the Dogs have come for Lamb.
Episode 4
Taverner is desperate to hide dangerous secrets. River seeks answers at his grandfather's house.
Episode 5
Lamb questions David about France as River comes face to face with the enemy.
Episode 6
Impossible decisions are faced and sacrifices are made.
