The Smoke Thieves have discovered that demon smoke is not only an illegal drug used for pleasure, but in fact, when taken by children, demon smoke briefly gives its users super-human strength. Aloysius' plan is simple and brutal: kill the demons for their smoke, and use that smoke to build an unstoppable army of children to take over Pitoria, Calidor, and then the rest of the world. The Smoke Thieves are the only ones who understand this plan--but can they stop it?