 Toward the end of his life , Miller wrote another installment of the Abbey of Saint Leibowitz saga , Saint Leibowitz and the Wild Horse Woman . A full @-@ length novel ( 455 pages ) significantly longer than its predecessor , it is set in AD <unk> , seventy years after the events of " Fiat Lux " but several centuries before " Fiat Voluntas Tua . " Suffering from writer 's block and fearful the new work would go unfinished , Miller arranged with author Terry Bisson to complete it . According to Bisson , all he did was go in and tie up the loose ends Miller had left . The novel tells the story of Brother <unk> St. George of the <unk> abbey who , unlike Brother Francis , wants to be released from his holy vows and leave the abbey . In addition to recounting his travels as Cardinal <unk> 's personal secretary , the book describes the political situation in the 33rd century as Church and empire ( <unk> ) vie for power . Miller died before the novel 's publication . 
