Pyramids is, so far, my favourite Terry Pratchett book. 
 The humour is sublime, and that's why I read him. 
 This takes place on the Discworld, but isn't part of any other series. The characters here don't get to have any more adventures. But that's fine, because their stories are complete. This is one of the true Discworld standalones (I know everyone says that you can read any Discworld book in any order, but that's madness!). 
 What actually happens in this book? An assassin that's taking his final exam receives a letter from home that he needs to return because he's the rightful heir to the throne. Then some stuff happens. 
 As it always is with Pratchett, the "stuff" doesn't really matter. I can't point to a single part of this book and tell you why it's my favourite in the series, because I've forgotten all of the funny parts that made me laugh, because jokes are fleeting and of the moment. And yet it's those jokes that make me love this book above his others. 
 Okay, here's a random quote from the book that I googled to cap this review off: 
 "People needed to believe in gods, if only because it was so hard to believe in people."