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After an attack on his Czechoslovakia spy ring, British intelligence agent John Shay (George Peppard) realizes one of his colleagues must be a double agent. John suspects Adam Booth (Keith Michell) is the mole, but his superior, Col. Scott (Nigel Patrick), refuses to investigate. With the help of secretary Polly Bendel (Judy Geeson), Adam uncovers classified files indicating that Adam is a KGB agent. With no support from his bosses, John takes revenge into his own hands. Wikipedia