Paul and Steve investigate an intriguing case of robbery and murder. Making their getaway after raiding Harkdale bank, a gang of thieves are surprised by the police and a car chase ensues. When the robbers' car crashes, killing two of them, the police go to retrieve the money, but it is not there.
Criminal investigating officer Hanne Wilhelmsen considers the possibility of a serial killer as she tracks down a series of numbers written in blood appearing on walls all over Oslo.