The Piaculum is at once hauntingly dark yet deeply spiritual. Set in the distant future, the story takes place on a desert landscape where a group of Christians called the Mone and a blood worshiping cult known as the Kathe are ensnared in religious tension. The Kathe believe that salvation can only be achieved by drinking blood from men born with a rare skin condition known as the white-mark. The novel follows the life of Cearl, a man with the white-mark born to a group of poor Mone farmers. Cearl has a good life with a wife and two children he deeply loves, but he finds himself consumed by memories of being tortured by the Kathe as a child, as well as an overwhelming feeling that his god wants something from him. When a group of Kathe come to Cearl's village looking for human sacrifices, Cearl comes face to face with his childhood memories and makes choices that could destroy his life.