Nils (Stellan Skarsgård) is a snow plough driver somewhere in Norway. He learns that his son has died, supposedly of a heroin overdose. Nils knows his son was no addict and starts a private investigation. Soon he finds out the local drug gang is behind the crime. He hunts down the two killers and kills both of them, but not before they confess. Based on this information, he goes after their boss, but finds himself in the crossfire between two rival gangs: one local, one "imported" from Serbia.