An idyllic lakeside vacation home is terrorized by Paul (Arno Frisch) and Peter (Frank Giering), a pair of deeply disturbed young men. When the fearful Anna (Susanne Lothar) is home alone, the two men drop by for a visit that quickly turns violent and terrifying. Husband Georg (Ulrich Mühe) comes to her rescue, but Paul and Peter take the family hostage and subject them to nightmarish abuse and humiliation. From time to time, Paul talks to the film's audience, making it complicit in the horror.