In Italy, a vacationing Englishman leaves his girlfriend for a wealthy mysterious American widow who's sailing the seas in search of her long-lost sailor friend.

Alan, after quarrelling with his girlfriend Sheila, becomes intrigued by Anna, a mysterious widow who's searching for a sailor she had known many years before. Alan and Anna begin the search on board a yacht bound for Greece, but they don't find the sailor. After a stop in Africa, Louis de Mozambique joins the party and suggests that the sailor may never have existed other than in Anna's mind.—Adalberto Fornario