Stefano is a shy and sensitive teenager who has just completed his studies in Switzerland and is considering becoming a monk. But his father, a rich Milanese publisher, who had the ambition to see his son succeed him, refuses and takes him on a cruise with a young woman to take this idea out of his mind...

Story of Roberta, a beautiful young woman from a wealthy industrialist family and her relationship with Franco, a rough car mechanic and stranger whom she meets on the beach of Forte dei Marmi.

Italy, the early 19th century. A villa is the home of a small English community, all rich and superficial people lounging about in its beautiful surroundings. Claire, George's wife, and Robert, her son, are murdered by a mysterious killer. Thinking the murderer is one of the family, distraught George devises a plan to unmask the culprit. Having met a woman, Ann, who is a dead ringer for Claire, he takes her back to the villa and announces their imminent marriage. Ann is considered an outsider and treated with contempt and hostility, while George fails to find any significant clue to the solution: everybody is to be blamed, at least morally, but the final revelation is more bitter than expected...