Hercule Poirot is vacationing on the Cornish coast when he meets Nick Buckly. Nick is the young and reckless mistress of End House, an imposing structure perched on the rocky cliffs of St. Loo. Poirot has taken a particular interest in the young woman who has recently narrowly escaped a series of life-threatening accidents. Something tells the Belgian sleuth that these so-called accidents are more than just mere coincidences or a spate of bad luck. It seems all too clear to him that someone is trying to do away with poor Nick, but who? And, what is the motive? In his quest for answers, Poirot must delve into the dark history of End House. The deeper he gets into his investigation, the more certain he is that the killer will soon strike again. And, this time, Nick may not escape with her life.

阿加莎·克里斯蒂被誉为举世公认的侦探推理小说女王。她的著作英文版销售量逾10亿册，而且还被译成百余种文字，销售量亦逾10亿册。她一生创作了80部侦探小说和短篇故事集，19部剧本，以及6部以玛丽·维斯特麦考特的笔名出版的小说。著作数量之丰仅次于莎士比亚。

阿加莎·克里斯蒂的第一部小说《斯泰尔斯庄园奇案》写于第一次世界大战末，战时她担任志愿救护队员。在这部小说中她塑造了一个可爱的小个子比利时侦探赫尔克里·波格，成为继福尔摩斯之后侦探小说中最受读者欢迎的侦探形象。1926年，阿加莎·克里斯蒂写出了自己的成名作《罗杰疑案》（又译作《罗杰 ·艾克罗伊德谋杀案》）。1952年她最著名的剧本《捕鼠器》被搬上舞台，此后连续上演，时间之长久，创下了世界戏剧史上空前的纪录。

1971年，阿加莎·克里斯蒂得英国女王册封的女爵士封号。1975年，英格丽·褒曼凭借根据阿加莎同名小说《东方快车谋杀案》改编的影片获得了第三座奥斯卡奖杯。阿加莎数以亿计的仰慕者中不乏显赫的人物，其中包括女王伊丽莎白二世和法国总统戴高乐。

1976年，她以85岁高龄永别了热爱她的人们。