539 pages ; 23 cm "Welcome to the silo ... Thousands of them have lived underground. They've lived there so long, there are only legends about people living anywhere else. Such a life requires rules. Strict rules. There are things that must not be discussed. Like going outside. Never mention you might like going outside. Or you'll get what you wish for"--Page 2 of cover "This work contains material previously published as Wool, Wool 2, Wool 3, Wool 4, and Wool 5"--Title page verso