Yul Brynner plays Vlassov, a senior Soviet spy who defects to the West and brings along a "gift" for his American host, a list of several high ranking Western officials who are Soviet double agents. If Bynner is telling the truth, every Western government has been infiltrated by Soviet intelligence and at the highest level. The case is a political time bomb and it's up to intelligence officials, Allan Davies (Henry Fonda) and Philip 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 set for a edge-of-your-seat adventure that's deadly real!