In the city called Ankh-Morpork, modern science and technology has made great progress. People gradually forget the traditional postal system and prefer the more convenient and faster Internet Clarks. But Clarks is not stable, because the system often crashes, the speed of network transmission is getting slower and slower. The lord of Ankh-Morpork, Viti Neri (Charles Dance), can no longer put up with Clarks's tyranny and slowness, and he decides to serve a sentence that has collapsed the traditional postal system. Vitineri locked the best candidate for Renaissance Post on Morester Van Leewig (Richard Coyle). This is a shrewd, cunning little liar. At the last minute, Vitineri laid down Morris, who was about to be hanged, and appointed him director of the post office. Morester could not escape, so he had to lead a group of old, weak and disabled soldiers to fight against Clarks. This film is based on Terry Pratchett's novel of the same name.