The Fifth Elephant: (Discworld Novel 24) by Terry Pratchett
SAM VIMES IS A MAN ON THE RUN. YESTERDAY HE WAS A DUKE, A CHIEF OF POLICE AND THE AMBASSADOR TO THE MYSERIOUS, FAT-RICH COUNTRY OF UBERWALD.
Now he has nothing but his native wit and the gloomy trousers of Uncle Vanya (don't ask). It's snowing. It's freezing. And if he can't make it through the forest to civilization there's going to be a terrible war.
But there are monsters on his trail. They're bright. They're fast. They're werewolves - and they're catching up.
The Fifth Elephant is Terry Pratchett's latest instalment in the Discworld cycle, this time starring dwarfs, diplomacy, intrigue and big lumps of fat.