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_The Fifth Elephant_ by Pratchett

Vimes is sent as an ambassador to the land where dwarfs, werewolves, vampires and people live together, though the people are a small minority. A new dwarf king is being crowned and there will be a big coronation. Angua finds out that her family is involved in a plot and sets off to stop it alone, Carrot follows. Vimes has to solve a mystery and help stop the conspiracy.