The Fifth Elephant by Terry Pratchett

In this book Samuel Vimes, commander of the Watch, is sent as Ankh-Morpork's ambassador to Uberwald where tempers are running high over the latest dwarf election and the ceremonial Scone may be missing. With the help of his sharp wife Sybil, Vimes must negotiate a diplomatic solution in a country full of vampires, werewolves, dwarfs, and Igors but noticeably short on the rule of law. I am enjoying the Watch books more and more.