As autumn fogs hold Ankh-Morpork in their grip, the City Watch have to track down a murderer who can't be seen. It's not as if the Watch hasn't got problems of is own. There's a werewolf suffering from Pre-Lunar Tenson. Corporal Nobbs is hob-nobbing with the nobs, and there's something strange about the new dwarf recruit, especially his earrings and eyeshadow. In the gloom of the night, Watch Commander Sir Samuel Vimes finds that the truth may be out there after all.
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