About the BookGOING POSTAL may be Terry Pratchett's most ingenious fictional invention yet. His satiric wit is honed to a fine edge as he takes a poke at bureaucracy, political chicanery, power mongers, organized crime, despots, fraternal organizations and mass information systems. One is tempted to compare Ankh-Morpork's arcane means of communication with the Pony Express or perhaps our early telegraph. But then there are those towers and the nerdy clackers, semaphore dweebs who live and breathe sending and receiving messages and deciphering codes and finding back doors to "clack" into private communiqués. Meanwhile, the trusty, dusty letter has been relegated to ignominy and it's Moist's sworn duty to bring it back.