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Amily Inglethorpe, the wealthy owner of the luxurious Styles Court estate, suddenly dies. Someone has dosed the woman with a lethal dose of strychnine. The main suspect is the deceased's husband, who is to inherit all the property in the event of Emily's death. But this would be too obvious... And, of course, the famous detective Hercule Poirot would not be interested in a simple case. Only he can solve the secrets that the rooms of the estate hide.