Director Dominic Cooke's historical drama stars Benedict Cumberbatch, Rachel Brosnahan, Jessie Buckley, and Merab Ninidze. Cumberbatch plays Greville Wynne, a British electrical engineer and businessman turned M16 agent who relays crucial intelligence about the Soviet nuclear program to the CIA. With the help of his Russian informant, Oleg Penkovsky (a.k.a. Ironbark), he aids the Western Bloc in defusing the Cuban missile crisis of 1962.