This book is one my favorite and, I believe, one of the best of Pratchett's Discworld Series. I can say it in one word: Carrot! He is one of my favorite heroes on the Discworld (only Rincewind and Nanny Ogg compare with Death a close third). As usual, Carrot comes through with flying colors. There are just so many interesting things in this book: the plot about the "gonne," Leonard de Quirm (and the way he acts with the Patrician), Cuddy the dwarf and Detritus the troll, the silly guildsand their ridiculous presidents, Carrot and Angua, I could just go on.
Especially good was the troll-dwarf issue, the way they had to work together to interview the guilds without making complete fools of themselves and just basically get along. Also, it is funny how intelligent trolls get in low temperatures.
The plot alos makes for a nice mystery story. Pratchett really worked on this one. We start out with a 4-man watch and end up with one over 60 people! The Watch really grows up and will add many laughs to future stories. One of the best: a must read.