Single mother Elaine is disturbed by her son Martin's aggressive behaviour, she visits his late father's estranged family in small-town Luxembourg, which hides a much darker nature. When she realizes that Martin could become like them, Elaine is forced into a desperate fight for her son's future.

After ten years abroad, Catherine returns to Luxembourg to catch up with her daughter Alba, brought up by Catherine's mother Elisabeth. She then kidnaps Alba and takes her on a trip to a lake up North.