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High-ranking KGB agent Alexei Vlassov (Yul Brynner) unexpectedly defects after a lifetime of service to his Soviet masters. He carries documents that purport to list all the double agents working for western intelligence services while secretly passing covert information to the Russians. CIA chief Allan Davies (Henry Fonda) harshly interrogates the suspicious turncoat, while British agent Philip Boyle (Dirk Bogarde) works in the field attempting to verify Vlassov's claims. Wikipedia