It's Hogswatch Eve, and the Hogfather - the Discworld's Santa Claus - has gone missing. The Assassins' Guild has been hired to inhume him, and the job has fallen to Mr Teatime, the most unsettling assassin in a guild full of them. Death steps in to deliver the presents (HO. HO. HO.), while Susan investigates. A novel about belief, imagination, and why humans need fantasy to be human.