 An unconscious man is found in a boat which drifts to the landing of an isolated African outpost where Baron von Ragenstein (Ralph Bellamy), an enemy agent, recognizes the man as his exact double, Sir Edward Dominey (Ralph Bellamy), with whom von Ragenstein went to school. He plots to kill Dominey and pose as the dead man.He learns about Dominey s broken marriage to Muriel (Evelyn Ankers) and his relation to Sir Ronald (Aubrey Mather), head of home defense. Back at the Dominey estate,Muriel is delighted with the change in Dominey, and Sir Ronald gives the spy a confidential position.The situation is complicated by Bardinet(Edward Norris), Muriel s admirer who, like von Regenstein, is under orders from Seaman (Henry Danielle), chief of the enemy agents. Another difficulty is Baroness Stephanie (Kaaren Verne), a spy who loves von Regenstein. The jealous Bardinet tells Muriel that Dominey is an imposter and she tells Sir Ronald. At Police headquarters Dominey reveals that, in Africa, it was actually von Regenstein that was killed and that he, Dominey posing as von Regenstein, has been playing the dual role in order to uncover the enemy leaders.