Larry Evans, champion race car driver, is envied by his chief rival, Eddie DeSylva, who has more ambitions than merely winning the races; he has designs on the motor patent held by Corbett (Tom Moore), Larry's employer. Eddie also has a yen for Corbett's daughter, Norma, who prefers Larry. Eddie intentionally causes a race wreck that injures Larry and sends him to the hospital.
Aircraft are being shot down by a large black plane with a big "X" painted on the wing. The chief suspects are invited for the weekend to an old dark mansion.
Cub reporter Daniel Greely gets a job on a big city newspaper. A string of robberies occur and the owner of the paper blames the police for not rounding up the crooks. Daniel discovers that a coded message in the newspaper's editor's box tips the crooks about each robbery.
The son of a disgraced Olympic decathlete prepares to become a star in his own right. His quest is complicated by a beautiful girl and a bitter rival.
A man's wife is put on trial for the murder of his first wife.
William Bakewell stars as an inventor who develops a high-powered boat engine. Bakewell, of course, created this wonder machine to benefit mankind-and, incidentally, to win an upcoming motorboat race.
A wealthy young woman, racked with guilt because she wasn't there when her mother died, is so desperate to contact her that she gets involved with a phony mystic who promises to put her in touch with her mother's spirit, but who is really after her money. A reporter who loves the young woman sets out to expose the phony "psychic" for the charlatan he is.
