Oscar Minno returns from working several years overseas and looks up his old flame Sandra. Sandra is widowed and lives in a childlike mental state on her family's estate, cared for by the overprotective Countess de Blanc. Sandra's son, Ricky, is suspected of having killed his father, Fabrizio, as well as a vagrant trespassing on the estate. Ricky is then sent to a reform school run by nuns. Oscar's doctor friend believes that Ricky is mentally fit and begins to suspect that there is much more to the story.