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While Jane Greystone, a New York operative with British Intelligence, is en route to Grand Central Station with vital shipping information, she is kidnapped by a phony taxi driver named George. On the way, the taxi is involved in an accident and Jane and George are picked up by an ambulance staffed by Dr. Michael Lewis. Jane claims to be suffering from amnesia, and George relays this information to his superiors. One of them, Mr. Goodwin, arrives at the hospital claiming to be Jane's father and brings with him Dr. Ingersoll, a specialist in amnesia and the real head of the spies. Jane tells Mike that Goodwin is not her father, but rather is a man determined to learn the secret she possesses. Mike does not really believe her, but nonetheless agrees to help her. When Goodwin insists on placing Jane under Ingersoll's care at his home, Jane begs Mike to accompany them. At the Goodwins', Mike soon realizes that he is being carefully guarded. His call to the hospital is monitored and he is not allowed to leave the grounds. When he notices a gun in the butler's pocket, he understands that he and Jane are prisoners. Soon, Ingersoll discovers that Jane does not have amnesia, and Mike is forbidden to see her alone. That night, Jane is drugged at dinner and Ingersoll injects her with a truth serum but she does not reveal her secret. In the meantime, Mike manages to escape and summons the sheriff, but when they arrive at the Goodwins', the house is deserted except for Ingersoll. Ingersoll suggests that Mike take his story to his old friend the district attorney and there convinces the district attorney that Mike is paranoid and should be committed. For a fee, one of Mike's jailers offers to help him escape, but outside, two of Ingersoll's thugs are waiting to take him to a secret headquarters inside Steiner's delicatessen. When Steiner tries to stop Goodwin and his men from executing their plans, he is killed. Jane then agrees to tell the spies what they want to know. Meanwhile, Mike overcomes his guard and pretends to be dead. After the spies transmit Jane's information to some waiting U-boats, she confesses that she lied. They are about to kill her when Mike breaks into the room, thus allowing Jane to telephone her contacts. On her advice, they dispatch fighter airplanes to the U-boats' location and the boats are destroyed. Jane and Mike are now free to admit their love for each another.