Jimmy Coghlan has developed such a notorious reputation for spending money, drinking and going to parties that his uncle and guardian, political boss "Big" Malone, insists that he settle down and get a job. Obediently, Jimmy opens a detective agency, but spends most of his time discouraging prospective clients. Finally, however, and partially against his own better judgment, Jimmy takes on a case, and to solve it he must join a band of criminals. Then, he falls in love with Lucia Andrada, one of the gang members, and discovers that the real leader of the gang is Malone himself. Jimmy denounces his uncle, after which he and Lucia, vowing to behave like responsible adults, begin making plans for their marriage.