Der kalte Finger (1996)

Conny works at the hospital. But she earns the real money together with her friend Bibi in a telephone sex agency. She has a special relationship with one of her clients who demands more than sex. He exploits her fantasies for his erotic productions. Conny has no idea that this eccentric artist is turning the sex tales into deadly reality. The obsessions increase from call to call. Conny believes he has the client under control. But then two women are found dead...