Eleven self-contained cases bring the retired Belgian detective Hercule Poirot up against jewel thefts, a vanished prime minister, an apparent suicide, a poisoning, and an Egyptian curse said to strike down members of an excavation. Each story is recounted by Captain Arthur Hastings, Poirot's loyal but frequently baffled companion, whose first-person narration follows the pair through London drawing rooms, country houses, and continental train journeys. Poirot solves the puzzles less through physical pursuit than through observation and reasoning, insisting on order, method, and the work of the "little grey cells" while Hastings chases the obvious lead. The cases are short and tightly plotted, often presented as a client's problem laid out at the start, examined through interviews and small overlooked details, and resolved with an explanation Poirot delivers near the close. Recurring figures include the Scotland Yard man Inspector Japp, who alternately competes with and defers to Poirot. The collection samples the kinds of crime Christie returns to across her career: substituted gems, faked deaths, family inheritance disputes, and threats aimed at public figures. The tone alternates between the lightly comic friction of the Poirot and Hastings partnership and the more serious stakes of murder and theft. The United States edition adds three further stories not in the original British printing, expanding the count to fourteen and including an early case that predates Poirot's career in England.