San Francisco police detective Scottie Ferguson is forced to retire when a freak accident gives him a severe fear of heights. When a rich shipbuilder hires Scottie to follow his wife, who may be suicidal, Scottie finds himself falling in love with her. Eventually Ferguson becomes obsessed with the chance to re-create her in another woman.
Sir Alec Guinness is Henry St. James, captain of an international ferry boat who has discovered the secret to the perfect double life: in Gibraltar he has a British housewife, while in Tangier his second wife is a hotblooded Spanish vixen. When the Captain becomes careless with anniversary gifts, he must see if he can not only outwit two betrayed wives, but survive a very serious firing squad.