This review is from: Thief Of Time: (Discworld Novel 26) (Discworld series) (Kindle Edition)
Thief of Time is a story about the History Monks and how they manage Time on the Disc. It's about a young apprentice to Lu Tze, the Sweeper, who first appeared in #13 Small Gods. It's also about the building of a clock so accurate that it follows the tick of the Universe.
By reputation this was supposed to be an excellent book and whilst it's toward the better end, particularly of the Discworld books I've read lately it didn't blow me away.
There's a lot of fun to be had though and I wouldn't want to put anyone off.