26. Pyramids, by Terry Pratchett.

Pyramids is written in the classic Terry Pratchett style, with all the quirks and foibles thereof. An heir to a small river kingdom suspiciously similar to Egypt  ends up teaming up with a camel called You Bastard in order to save said kingdom from a strange and bizarre cataclysm.

I enjoy reading Terry Pratchett books because they're so humorously unserious, but they still manage to address some seriously large ideas, like the concept of change. I like reading books that make me think, and this one  has made me think harder than I was initially expecting, while covering its depth with a shiny cover of mischief.