Farlig yrke (1976)

Secretary Benedicte Holst walks into Vestre Cemetery on her way home from work. And disappears without a trace. Helmer and Sigurdson soon have a murder to deal with. Benedicte is found dead, drugged with ether before drowning. And after another female secretary is reported missing, the police fear they are facing a serial killer. Can they prevent him from striking again?