Commanded by the cruel Garrick, Jem is a Watchman and hunter of Disses: rebels who dare to challenge the Tower and its ruling Council. Loner by design and killer by nature, he's unapologetically part of the cruel regime until a new assignment exposes a web of deceit, and past sins demand their reckoning. When a young boy elicits his sympathy, and an enigmatic woman his interest, Jem is made to question everything he believes before undertaking one last terrifying mission. Now he must do unto others if he's to take care of his own.