Feet of Clay - Terry Pratchett

"This is fantasy served with a twist of Monty Python, parody that works by never taking itself too seriously." —Publishers Weekly
Murder! Mahem! Bacon sandwiches! People are dying suspiciously in Ankh-Morpork, and Sam Vimes of the City Watch will find the truth. Another brilliant and hilarious Discworld adventure from beloved New York Times bestselling author Terry Pratchett
For Commander Sam Vimes, Head of the Ankh-Morpork City Watch, life consists of trouble . . . and more trouble: a werewolf with pre-lunar tension, a dwarf with attitude, a golem who's begun to think for itself. Now he's got the unusual deaths of three elderly Ankh-Morporkians on his hands. It's murder in Discworld!—which ordinarily is no big deal. The problem is, the deaths do not bear the clean, efficient marks of the Assassins' Guild; there's an apparent lack of motive, and there's no trace of anything alive having been at the crime scene. What Vimes does have are some tracks of white clay and more bothersome "clue" thingies that muck up his investigations.
The anger of a fearful populace is already targeting the city's small community of golems—those mindless, absurdly industrious creatures of baked clay, who can occasionally be found toiling in the city's factories. And certain highly placed personages are using the unrest as an excuse to resurrect a monarchy—which would be bad enough even if their would-be "king" wasn't as empty-headed as your typical animated pottery.
In addition to quieting the restless populace, Vimes has to find out whodunit—and howdunit too. He's not even sure what they dun. But as soon as he knows what the questions are, he's going to look for some answers.
The Discworld novels can be read in any order, but Feet of Clay is the 3rd book in the City Watch collection and the 17th Discworld book.
The City Watch collection in order:

Guards! Guards!

Men at Arms

Feet of Clay

Jingo

The Fifth Element

Night Watch

Thud!

Snuff