Deft comedy-mystery finds Brooklyn actress Lombard deciding to take an ocean voyage and pass herself off as a Swedish princess in the hopes of furthering her career. Bandleader MacMurray is smitten but an old beau recognizes the ruse and demands hush money. Then he turns up dead and the duo fall under the suspicious eye of a German passenger (Rumann) who happens to be a detective. From the novel by Louis Lucien Rogger.