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On a plane leaving London, Colonel Fenwick tells his daughter the story of a man on the plane who once meant more to England than anyone else alive. The colonel explains that in 1917, when deadlocked battle fronts forced each side to turn to espionage, British Naval Officer Lieutenant Michael Bruce, was called upon to impersonate Baron Kurt Von Rohbach, a captured German officer of the famed Imperial Lancer Guards. After Bruce says goodbye to his wife and daughter, who thereafter believe him to be lost at sea, Colonel Fenwick of British Intelligence arranges for Bruce, as Von Rohbach, to escape. In Berlin, German General Von Meinhardi gives Bruce a hero's welcome to boost morale. German intelligence officer Lieut. Col. Gottfried Hollen and Major Sigfried Gruning suspect that Bruce is an impostor and, eager to discredit Von Meinhardi, send dancer Dolores Daria to seduce him. Bruce subsequently duels over Dolores, and after Dolores reports that she has learned nothing, Hollen sets a trap by telling Bruce of a spy planted in the British Admiralty. Knowing that Bruce is not the baron, Dolores, who has nevertheless fallen in love with him, warns him that informing the British about the spy will give Hollen proof of Bruce's espionage. After Gruning shows Hollen a newspaper photograph and article reporting that Bruce has been lost at sea, Hollen arranges for Bruce's home in Norfolk to be robbed. With samples of Bruce's handwriting, Hollen tries to inform Von Meinhardi, but the general, after a meal with Dolores and Bruce, has a heart attack. Bruce, with Von Meinhardi's keys, locates the West Front battle plans and, with the help of Dolores and a tailor working for the British, escapes as a train porter to Switzerland. Colonel Fenwick finishes his story about Bruce by telling his daughter that the plans became the greatest factor in England's victory, and he surmises that Bruce is traveling to Berlin to pay an annual visit to the grave of Dolores, who was executed.