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Clara Koller, a widow, has the important job of handling the budget of a manufacturing company engaged in a secret government project. When she is asked to join a friendship club she accepts, unaware that the club is a front for enemy agents.
A Dr. Haas has set himself up as head of German fencing society, whose youthful members he uses to further his own subversive plans. Peter Gebhardt joins in an attempt to learn of plans to establish a new regime.
Attempting to break up a Communist spy ring in Alaska, Captain John Rand enters the penitentiary as a prisoner to become friendly with a Red agent, help him to escape in the hope that he will lead Rand to other members of the ring.