Georg and Anna, and their son Georgie, are traveling to their lakeside summer home. Upon arrival, Georg and Georgie head off to the lake for sailing while Anna prepares dinner in the kitchen. The serenity is shattered by a young man named Peter, who knocks at the door asking to borrow some eggs. The unwanted visitor is joined by Paul, a brash, arrogant young man. It soon becomes clear the pair has no intention of leaving. When Georg returns and tries to throw them out, physical violence erupts, and the family is held captive. What ensues are highly disturbing and violent games that are initiated by Paul and Peter with Georg, Anna, and Georgie as the unwilling participants.