It tells the story of two teenage girls in Berlin, one of whom takes revenge on the daughter of her father's lover.

Kati endures a modest and difficult home life with a neurotic mother, but Steffi's family are well off and harmonious.

That having failed, Steffi sends her to the pornographer Winter, having got the address from a schoolmate Yvonne, who posed to earn some money so that she could leave home.

Suspecting the pornographer, Kati recounts all she knows to the police, who tell her Yvonne has in fact been murdered.

By calling an ambulance, Kati saves her life and at the hospital Steffi's parents turn up, apparently reconciled.