Cast & Crew
Veteran policeman Dan MacDowell and his son Jack are being honored at the celebration of the addition of aviation to the police force. Jack, the first flying officer, meets Gwen O'Day, daughter of a wealthy jeweler, when she christens a plane, and they fall in love; later, O'Day asks Jack to assist him in solving numerous jewel robberies of his customers. Dan MacDowell, meanwhile, is retired from the force on his 65th birthday, but O'Day gives him a night watchman's job in his store. With the help of his father, Jack gathers clues on the case, and suspicion soon falls on Robert Chandler, O'Day's business advisor, who is later revealed to be the secret leader of some diamond thieves. Gwen is locked in a vault while the thieves make their getaway, the leader taking to the air. Events culminate in a night air battle in which the villains are subdued.