NOS4A2 by Joe Hill
My rating: 4 of 5 stars
This will probably sound wrong, but I saw NOS4A2 as a much darker version of Pratchett's Hogfather - the same idea of a world that exists if you believe in it seemed to run through both books. Of course, this doesn't have DEATH, but it does have Death and mayhem, and a heroine who tries to shirk her duties because she's convinced herself that the Shorter Way Bridge was all a hallucination.
Unlike most horror books, I don't think this will keep people up at night. Instead, it might make people rethink Christmas and its ever longer season (one can hope, right? I mean, really: Jingle Bells in July? No thanks!). The Evil, Charlie Marx, is an interesting villain, just bad enough to make you wonder about the slightly odd guy one street over. Ditto Gasmask Man.