Snuff (Terry Pratchett)

Sam is dragged away on a vacation in the country by his determined wife, away from his beloved city streets, and anticipates two weeks of mind-numbing boredom until his sensitive cop's nose detects a whiff of crime. Before he has unraveled the whole sordid ball of string, he has been proved a hero yet again, on land and sea, solved crimes of murder and smuggling, and helped to recognize an entire new race of sapient creatures. Just his kind of vacation!  In the hilarious, fantastical world that is Discworld, the subset of Sam Vines books put less emphasis on madcap hijinks and more on an examination of what it means to be a good cop in a chaotic world. Not to imply that there isn't plenty of hilarity to go around! Still, much of the story is about how to make things right within the law. I enjoyed it quite a lot.