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U.S.Security Investigation Division chief Paul Reagan (Richard Denning) assigns John Williams (John Ireland) to hunt down a subversive group that has been smuggling A-bomb parts into the United States in specially designed cases. Williams traces the ring to Marseilles, France, where he meets Margo Wayne (Suzanne Dalbert) at a waterfront café and discovers she is part of the plot. After being recalled by Reagan, Williams is informed that he has been engaged in a "war games" security check to test America's atomic defense, but he proves to Reagan that enemy agents are using the war games as a front to smuggle an A-bomb into the country.
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