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?

The Olsen Gang has traveled south after the success of their last coup, but there's still someone who hasn't given up catching them.

A stand-up comedian who loses his train of thought and his wife takes over the show with resounding success.