Feet Of Clay, by Terry Pratchett (1996, UK)

A Discworld novel. Samuel Vimes is investigating over some murders and the (mysteryously) continuous poisoning of Vetinari. No clue till the end. Other lives develop in the middle: Angua the werewolf and her troubled story with Carrot (both in the Watch), Chery Littlebottom that decides to out her female nature although beared dwarf, Nobby who might be noble, golems' right to be free... Deep and hilarious in the same time.