Two married couples are murdered by an unknown person, including the restaurant owners Sardini, whose daughter is the only survivor. She can't remember anything, but criminal psychologist Annett Schuster and profiler Jan Kawig think she is the key to solving the case.

Katharina, Ricky, Victoria and Malou live in an assisted living group. There they have built up an anarchic utopia as an alternative to everything they reject: Parents, school, rules. With social worker Ballack as a half-hearted guardian, things go well until their “live and let live” agreement starts to falter.