“So, who killed whom?” That’s the exact question writer Ariadne Oliver asks. But this time the question is connected not with the plot of her new novel, but with a real crime from her own past. Ariadne can’t stop thinking about the mysterious death of a married couple—her friends—which happened twelve years ago. At the time, the tragedy was considered a double suicide. But Mrs. Oliver thinks otherwise… And then she asks for help from her old acquaintance—the great detective Hercule Poirot. The case immediately captures the Belgian’s relentless attention, and he sets out at once to investigate it. For Poirot, the old crime is not something that has lost relevance, because he knows from his own experience: murders, like stories, have an unpleasant habit of repeating themselves…