There is some underground politics going on with the dwarfs in Ankh-Morpork. Then Vetinari appoints Vimes as Ankh's embassador to Uberwald right after a copy of a religious artifact from the dwarf museum is stolen. So Vimes has to change gears to act diplomatic on the surface, solve the mystery like the copper he is, and make it look like he is enjoying a holiday with his wife.

I wasn't expecting to see Sam Vimes trying hard to be a diplomat, but it was pretty funny. It was great to see Lady Sybil using her knowledge and heart to beat everyone else at their game. I enjoyed this book a lot, the watch series keeps getting better and better.