After discovering a fragment of a Phoenician amphora while in Corsica, 25-year-old scuba diver Gerard goes hunting for a treasure Troilus is alleged to have lost in the sea following the Peloponnesian War. His meeting with the lightkeeper's beautiful daughter Manina jeopardises his goals.

Handsome and rich Spanish gentleman abandons his wife and riches for his love of a young girl of poor stock who taunts and degrades him.