In this cold-war true-life spy thriller, unassuming British businessman Greville Wynne (Benedict Cumberbatch) becomes entangled in one of the greatest international conflicts in history, recruited by MI-6 and a CIA operative (Rachel Brusnahan, and at the behest of the UK's MI-6 and the CIA, he forms a covert, dangerous partnership with Soviet officer Oleg Penkovsky (Merab Ninidze) in an effort to provide crucial intelligence needed to prevent a nuclear confrontation and defuse the Cuban Missile Crisis.