A serial killer is on the loose in Oslo. He kills and leaves mysterious notes under the bodies with lines from a children's song. Problems pile up for investigator Cato Isaksen, both in relation to his two families and the murder cases.
Cato Isaksen
Vetle
Sigrid Velde
Georg
Roger Höibakk
Preben Ulrichsen
Randi Johansen
Asle Tengs
Ellen Grue
Ingeborg Myklebust
Sonja Pettersen
Aina Viken
Cheryl Therkelsen
Kim Khan
Elsa Bakke
Frank Terminus
Bergljot Behrens
Simon Andersen
