Hollywood. 1955. Faced with two inexperienced actors, a film director encourages the leading lady and leading man to fall in love in real life so as to provide the heat needed for the inner film's romance, which enrages the actress' possessive gangster boyfriend, who happens to be the film's financier.

New York's Odyssey Detective Agency is hired by two different clients to follow two women suspected of infidelity. Ladies' man John Russo trails Angela Niotes, the elegant wife of a wealthy Italian industrialist, while Charles Rutledge and Arthur Brodsky follow Dolores Martin, the beautiful young wife of a jealous husband. Their respective cases are complicated when John falls for Angela, and Charles falls for Dolores.