Sir Alfred de Carter (Rex Harrison) is a world-famous symphony conductor who returns from a visit to his native England and discovers that his rich and boring brother-in-law, August Henshler (Rudy Vallée), has misunderstood Alfred's casual instruction to watch over his much younger wife Daphne (Linda Darnell) while he was away, and instead hired a detective named Sweeney (Edgar Kennedy) to follow her. Alfred is livid, and ineptly attempts to destroy any evidence of the detective's report.