Season 2 - Helmer and Sigurdson

Secretary Benedicte Holst walks in on Vestre Gravlund, on her way home from work, and disappears without any trace. Helmer and Sigurdson soon gets a murder to deal with. Benedicte is found dead, drugged with ether before being drowned. And, after another woman secretary is reported missing, the Police fears that they are dealing with a serial killer. Can they prevent him murdering again?