Insurrection is in the air in Ankh-Morpork. The Haves and Have-Nots are about to fall out all over again. Captain Sam Vimes of the city’s ramshackle Night Watch is used to this. It’s enough to drive a man to drink. Well, to drink more. But this time, something is different – the Have-Nots have found the key to a dormant, lethal weapon that even they don’t fully understand, and they’re about to unleash a campaign of terror on he city. Time for Captain Vimes to sober up.