The silo has strict population control policies. Robert discovers the reality, and heartache, of what happens when mandatory birth control fails. Follow Robert's journey to the silo's underground resistance as he aims to help those who discover they are pregnant without a license in this book set in Hugh Howey's world of Wool. The Underground books are individual stories about silo citizens finding themselves participating in the resistance movement. The Bishop takes place many years before the events in The Pawn. This story uses plot elements from Wool, parts one through five (i.e., Wool Omnibus).