This year, I'm re-reading the Discworld City Watch books. I'm now at the sixth book (Discworld #29), "Night Watch".
I bought the hardcover version when it came out in 2002 I remember it as sad and as capturing the real reasons why we resist authority, even when we know we'll lose. For me, it marks when the Discworld books really became serious about politics and power. It's an odd book. Vimes travels back in time to an uprising in an earlier Ankh-Morpork. The events seem to be broadly similar to the doomed Paris Commune of 1871.
I have the original hardcover in front of me now. I'm re-reading it for the first time in seventeen years.
I hesitated to re-read this as it's one of my favourite Terry Pratchett books (the only rival being "I Shall Wear Midnight", the book where Tiffany Aching grows up) but I think that, with all the crap going on in the UK at the moment, it's time to read this again and share in the anger and courage that Terry Pratchett gifts Vimes with.