Going Postal
The first Moist Von Lipwig book finds the young conman saved from the noose and given a second chance by the Patrician and tasked to take on the disaster that is the Post Office in Ankh-Morpork.
The scams and schemes that Pratchett puts Lipwig through are ingenious and frequently hilarious. This is a very good Pratchett if not in Night Watch or Small Gods class.
Totally recommended.