Nurse Amy Leatheran takes a private post in Iraq, hired to attend the wife of a distinguished archaeologist running an excavation far from any city. From the moment she arrives at the isolated expedition house, she senses that something is wrong. Mrs. Leidner is gracious yet frightened, convinced that she is being watched and that her life is in danger. She speaks of threatening letters and of a face glimpsed at her window, and the close-knit members of the dig regard one another with growing unease as the tension tightens around them. When death comes inside the locked compound, suspicion falls on everyone present, for no outsider could easily have reached the victim. Hercule Poirot, travelling through the region, is drawn in to untangle a puzzle complicated by old loyalties, professional rivalries, and a past that refuses to stay buried. Narrated entirely by the practical, plain-spoken nurse, the story unfolds through her eyes as she records the small frictions of life on a remote site and the slow exposure of secrets each person would rather keep hidden. Christie draws on her own seasons spent at Middle Eastern digs to render the heat, the routine, and the strange intimacy of a household sealed off from the world. The investigation turns on character and observation as much as on physical evidence, building toward a resolution that asks the reader to reconsider everything the nurse believed she understood about the people around her.