A generation ship left earth 500 years ago. Now damaged, it is filled with modified humans, angels, demons, and a manufactured religion. The warring factions must be united to repower the ship before the star goes nova. A young angel named Sir Perceval and her sister Rien are in the center of the war to retake the ship. A mix of biblical and Arthurian imagery, which mostly works but is sometimes jarring. Probably not for everyone, but I enjoyed it