The story of Wool takes place on a post-apocalyptic Earth. Humanity clings to survival in the Silo, a subterranean city extending one hundred forty-four stories beneath the surface. The series initially follows the character of Holston, the sheriff of the Silo, with subsequent volumes focusing on the characters of Juliette, Jahns, and Marnes. An ongoing storyline of the series is the focus on the mystery behind the Silo and the secrets it holds. The Silo's mystery is eventually revealed by the end of book five; books six through eight comprise a prequel to the series. Book nine pulls the storylines together.
