Yul Brynner plays Vlassov, a senior Soviet spy who defects to the West and brings a "gift" for his American host, a list of several high-ranking Western officials, who are Soviet double agents. If Vlassov is telling the truth, every Western government has been infiltrated by Soviet intelligence at the highest level. The case is a political time bomb and it's up to intelligence officials, Davies (Henry Fonda) and Boyle (Dirk Bogarde), to put a stop to it. And in the espionage business, there are no good guys or bad guys- only professionals. Get ready for an edge-of-your-seat adventure that's deadly real!