It seems it was about a year since I reviewed the previous Pratchett book, Going Postal. This time he's back with the Ankh-Morpork City Watch led by Sam Vimes. There's unrest among the dwarves and trolls over the anniversary of a battle between their races. Someone important gets killed and the watch have to solve the case to prevent a war.

The Watch stories are generally good. There are some strong characters, with some new additions this time. There is some mysticism involved, but it boils down to an old copper using his wits. It's probably more Sweeney than Morse. Really it's about people who happen to live in a magical world. I probably missed a lot of references, but there is a running one to The Da Vinci Code.

I really enjoyed it, but then I've read most of his books. It's not to be taken too seriously, but it rewards a little thought.