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. When 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 actually using the "war games" as a front to smuggle an A-bomb into the country.
The 49th Man
During the Cold War, the Defense Department's War Games team smuggles 48 nuclear bomb parts into the USA to test the nation's readiness for a subversive attack but an unexplained 49th bomb part mysteriously shows up.
