Everything you need to understand or teach The Snowman by Jo Nesbo.
In The Snowman by Jo Nesbo, a serial killer leaves a snowman as his chilling signature at the scene of his crimes. Delving into the case, detective Harry Hole finds a connection between the women killed by the Snowman and their children, all of whom have an incurable disease that is being treated by the same doctor. The story unfolds as the killer seeks revenge for his own genetic illness. Conceived during his mother's extramarital affair, he blames her for the disorder. As the characters face their personal monsters, themes such as guilt being a disease and revenge as a motivator are explored.