'Salem's Lot
Roughly every 23 years, the Callas are raided by wolves, which turn out to be robotic soldiers serving the Crimson King. These Wolves steal half of the Calla's children, who return a few months later "roont". "Roont" (ruined) children are sterile, mentally handicapped, grow to be larger and stronger than other children, and die painfully at a younger age. When Roland and his ka-tet arrive, Callahan seeks their help to defeat the Wolves. During their stay, he shares with them his story since the events of "'Salem's Lot". The Wolves are defeated with the help of the ka-tet, but Susannah becomes possessed by the demon succubus known as Mia and escapes via the Doorway Cave. There, Callahan discovers a copy of the novel "'Salem's Lot", in which he is a major character, causing him to question his reality.