After Thomas and the other gladers and newfound allies have settled into their 'normal' lives in paradise and all the adventure to keep them distracted has stopped, Thomas is finding it hard to live with himself knowing what he watched happen to Alby, Chuck, Teresa and Newt. Newt. Even thinking of him sends Thomas into a hopeless pit of despair and soon, an obvious darkness has wrapped its way around Thomas' heart and everyone can see it. With help from some quite unlikely allies and some faces he never expected to see again, can Thomas manage to free himself of the overwhelming guilt he feels or will the darkness consume him?