Yvonne is seething when her devoted son, Michael, declares his intention to marry Madeleine, despite the latter's admitting to having an affair with a mysterious older man. At the same time, George, Michael's father, confides in Yvonne's sister, Leo, that he is in fact Madeleine's other lover. Together, they hatch a plot to end Madeleine's hopes of marriage - by threatening to reveal George's scandalous secret to his son.

一個表面美滿的五人家庭，各人背後均有著不可告人的秘密。
在女兒訂婚的晚上，身份神秘的探員突然到訪調查一宗年輕女子的自殺事件。這宗案件在這家庭翻起巨浪，令各人陷入精神崩潰狀態。