Thud (by Terry Pratchett)

Re-reading my way slowly through Terry Pratchett’s ‘Discworld’ series, I reached ‘Thud’, the 34th series. We bought the hardback edition shortly after it was first published, towards the end of 2005, and I read it aloud to my teenage sons - finishing just before my elder son left home. I hadn’t read it since then, and had entirely forgotten what it was about.
‘Thud’ is one of the ‘Watch’ books, a direct sequel to ‘Monstrous Regiment’, at least as far as Sam Vimes goes. He has a young son now, ...