Adam Hart, investigator of the occult, and his faithful companion Victor Janis, are contacted by a young woman, Myra. She's worried there's something wrong with Robert, the man she's just married. She explains that since the day he overcame his fear of heights - to save her from falling off a bridge in front of a train - he's behaved strangely, for instance appearing in the streets while claiming to be at home. Myra, afraid that Robert will kill her, asks Adam and Victor to accompany her and Robert on their honeymoon to the Sahara Desert. They agree. On the ship bound for Tripoli, Adam and Victor meet a doctor, with whom Adam fiercely debates the existence of the supernatural. The doctor refuses any such nonsense, but Adam baffles him with his great knowledge and razor-sharp wit. Meanwhile, an unseen stranger attacks Robert, throwing him overboard. But just as the ship's crew is trying to retrieve him, Robert shows up on deck, having apparently somehow managed to climb back onboard. ...

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