Marco Silvestri is a sailor who has cut off ties with most of his family, returns home after the suicide of his brother-in-law. At the urging of his sister, Sandra, who believes that her husband's death was caused by one of their creditors, Marco tries to avenge his family. He moves into an apartment above the one occupied by the creditor, Edouard Laporte, and begins an affair with his wife, Raphaëlle. Marco discovers that his sister is deep in debt and that his niece, Justine, has been hospitalized and might need reconstructive surgery as her vagina has been badly damaged. After some investigation he believes that Edouard was the one who injured his niece by penetrating her with a corn cob.