Mothers are disappearing and left behind in their place are snowmen - the only clue that a serial killer is at work. Detective Harry Hole is convinced that the killer is playing a game with him because of a letter left for him.
This is a Scandinavian serial killer mystery by Jo Nesbo who is hailed as the next Steig Larrson. I can't comment on the comparisons to Larsson as I have got to be the only person left who hasn't read his Dragon Tattoo books (it is in my TBR stack). But, I can say this is a very good mystery. Nesbo's hero, Harry Hole, is tough, gritty, damaged goods who reminded me a lot of Michael Connelly's Harry Bosch. Could be because they share the same name but I don't think it is. I think the characters are very similar.
This book was quite scary for a murder mystery and I felt that Nesbo dared to go further than many American authors would. And I liked it.