Taverner and Tearney face off for control of MI5. River and Louisa find themselves caught in the crossfire.
The Slow Horses fight for their lives. Lamb shares some devastating truths with Catherine.
A discovery by Sumner sends Drax into a murderous rage. Cavendish proves crucial in Baxter and Brownlee’s plan. An arctic storm rages and threatens the safety of the ship’s crew.
When Professor T is jailed and finds the sights, sounds and smells of prison hard to take, Dan and Lisa try to distract him with a murder case.
