Millionaire Lemeni hosts a cruise aboard his yacht along the Sicilian coast. His passengers include French industrialist Albert and his opera star wife, Adrienne; Albert's mistress, magazine editor Elena Lagarde; Adrienne's lover, Count Luca di Sauvin [according to Italian sources Alberto has hired Luca to seduce Adriana so that he can obtain a divorce]; Lemeni's seductive but featherbrained girl friend, Marilla; Lemeni's son, Hugo, an ardent bicycle racing enthusiast; Luciana, a cover girl hired by Lemeni to arouse Hugo's interest in women; and Walter, a photographer employed by Lemeni. Walter's jealous fiancée, Greta, swims aboard as a stowaway when the boat leaves port. In the course of the voyage, Albert and Adrienne discover that Luca is Elena's former husband, and the divorced couple are reunited. Luciana's efforts to seduce Hugo fail, but he eventually meets Greta, and they fall in love. The confusion subsides, and before the cruise is over everyone has found romance.