Richard Hanney has a rude awakening when a glamorous female spy falls into his bed - with a knife in her back. Having a bit of trouble explaining it all to Scotland Yard, he heads for the hills of Scotland to try to clear his name by locating the spy ring known as The 39 Steps.

Lawyer Federico Fendi has reasons to suspect that his fashion model wife Carla is secretly one of Rome's highest paid call-girls.

A Shakespearian actor starring as Othello opposite his wife finds the character's jealous rage taking over his mind off-stage.

Georgia Garrett is sent by jealous wife Elvira Kent on an ocean cruise to masquerade as herself while she secretly stays home to catch her husband cheating. Meanwhile equally suspicious husband Michael Kent has sent a private eye on the same cruise to catch his wife cheating. Love and confusion ensues along with plenty of musical numbers.

Flirtatious mix-ups abound when a celebrated novelist tangles with an old flame and her suspicious husband. Will the author's savvy secretary, who's secretly in love with him, save his neck?

A married couple, suspecting one another of infidelity, decide to "live separately together."