Psychological thriller is based on the novel of the same name by Jo Nesbø, and follows inspector Harry Hole, the inspector of the Norwegian Police Service's Oslo district, as he tracks a serial killer who builds snowmen at his crime scenes. Harry receives a mysterious letter signed with a childlike drawing of a snowman. Together with a new recruit Katrine Bratt he starts investigation of Birte Becker disappearance. The two find a snowman at Becker's home.