Life is hard for Mokryst von Gubwig, an extraordinary swindler, a master of artistic forgery, and a real specialist in fakes. He too faces a difficult choice: be hanged or turn the Mail Service of Ankh-Morpork upside down. After making an uncertain, ambiguous decision, he now has to ensure that, despite rain, snow, dogs, and off-road conditions, the consistently scrupulously honest and ethical competitors of the Friendly and Benign Union of Postal Workers—and the midnight murders of the mail—are still delivered on time to where they’re supposed to go.