When a rare mental disorder begins to consume his small-town neighbors, a young psychiatrist digs up the past for clues to the epidemic's bone-chilling source in this brilliant supernatural horror debut, written in the bestselling tradition of Peter Straub. Convinced that evil spirits have overtaken his daughter, a desperate father introduces her to Nat Thayer, a young psychiatrist in their sleepy blue-blooded Massachusetts college town. Thayer quickly diagnoses the girl with Cotard Delusion, an obscure condition sometimes described as "walking corpse syndrome." But Thayer soon realizes his patient--and many of the local families--are actually being targeted by a malignant force resurrected from the town's wicked history. Thayer must discover the source of the spreading plague...before there is no one left to save.