The film stars Harry Townes, Irja Jensen, Jacques Aubuchon, Robert Goodier, Albert Miller and Caren Shaffer.

The embassy's chief military attaché, Colonel Rostovich, tasks Volov with liquidating Gouzenko to quell further defections by Soviet officials to the West.

Upon getting the answer, the Soviets prepare their trap, at the same time cancelling any further attempts to track Gouzenko in order to lull him into a false sense of security.

At the meeting place, a crowded market, Gouzenko follows Volov through the throng of people, as agreed, and over the Jacques Cartier Bridge to Saint Helen's Island.

Once in the seclusion of the island's park, the ambush is sprung; but instead of killing Gouzenko, Volov, having had a change of heart since his army service in World War II and having since plotted his own defection, gives him a list of Soviet spies still operating in Canada, and Chertok is arrested by Boucher.