Der kalte Finger (1996)

City girl Conny (Gruschenka Stevens) leads a double life on the telephone in Der kalte Finger (1996), working days as a hospital receptionist and as a phone-sex girl by night. Bored by her working life and affair with a doctor at the hospital, she becomes more and more involved in a phone-sex relationship with a customer known as "Der kalte Finger". But will she realize he's a serial killer before it's too late? Gruschenka is anything but gruesome when Der kalte Finger ties her fully nude body to a motorbike then goes for a ride. Eva Haßmann and Maria Schalkhauser also bear their goods as the killer’s other victims.