After surviving a difficult year, Natalie Marsh is heading for Ellsberg Keep, an exclusive mountain resort that promises to provide the tranquility she desperately needs. She's eager to relax and to reconnect with her estranged cousin Lily, who works as the Keep's nurse—a reunion that begins abruptly when an accident on the winding mountain roads lands Natalie in the infirmary in the care of her cousin. They have little time to bond over childhood memories, however. Everything is thrown into chaos when the owner of the Keep is rushed to the medical wing, wildly delusional and raving about a murder plot. Despite Lily's care, the owner dies. Is his death simply an accident, or are his frenzied suspicions true? Determined to help Lily cope with the loss of her patient—and the accusations that she's to blame for his death—Natalie searches for answers and is swept into a mystery that grows more puzzling as frightening hallucinations torment the dead man's son. When a staff member who asks too many questions disappears, it is clear that idyllic resort harbors someone with deadly intent—and Natalie may not survive to uncover the truth.