A young man, broken down in the fog, witnesses a murder he is asked to conceal...A full-length novel adapted by Charles Osborne from Agatha Christie's acclaimed play. When a stranger runs his car into a ditch in dense fog in South Wales and makes his way to an isolated house, he discovers a woman standing over the dead body of her wheelchair-bound husband, gun in her hand. She admits to murder, and the unexpected guest offers to help her concoct a cover story. But is it possible that Laura Warwick did not commit the murder after all? If so, who is she shielding? The victim's retarded young half-brother or his dying matriarchal mother? Laura's lover? Perhaps the father of the little boy killed in an accident for which Warwick was responsible? The house seems full of possible suspects! THE UNEXPECTED GUEST is considered to be one of the finest of Christie's plays. Hailed as 'another Mousetrap' when it opened on 12 August 1958 in the West End, it ran for 604 performances over the succeeding 18 months and has been staged many times around the world over the last 40 years.

無可爭議的偵探小說女王，偵探文學史上最偉大的作傢之一。

阿加莎•剋裏斯蒂原名為阿加莎•瑪麗•剋拉麗莎•米勒，一八九〇年九月十五日生於英國德文郡托基的阿什菲爾德宅邸。她幾乎沒有接受過正規的教育，但酷愛閱讀，尤其癡迷於歇洛剋•福爾摩斯的故事。

第一次世界大戰期間，阿加莎•剋裏斯蒂成瞭一名誌願者。戰爭結束後，她創作瞭自己的第一部偵探小說《斯泰爾斯莊園奇案》。幾經周摺，作品於一九二○正式齣 版，由此開啓瞭剋裏斯蒂輝煌的創作生涯。一九二六年，《羅傑疑案》由哈珀柯林斯齣版公司齣版。這部作品一舉奠定瞭阿加莎•剋裏斯蒂在偵探文學領域不可撼動的地位。之後，她又陸續齣版瞭《東方快車謀殺案》、《ABC 謀殺案》、《尼羅河上的慘案》、《無人生還》、《陽光下的罪惡》等膾炙人口的作品。時至今日，這些作品依然是世界偵探文學寶庫裏最寶貴的財富。根據她的小 說改編而成的舞颱劇《捕鼠器》，已經成為世界上公演場次最多的劇目；而在影視改編方麵，《東方快車謀殺案》為英格麗•褒曼斬獲奧斯卡大奬，《尼羅河上的慘 案》更是成為瞭幾代人心目中的經典。

阿加莎•剋裏斯蒂的創作生涯持續瞭五十餘年，總共創作瞭八十部偵探小說。她的作品暢銷全世界一 百多個國傢和地區，纍計銷量已經突破二十億冊。她創造的小鬍子偵探波洛和老處女偵探馬普爾小姐為讀者津津樂道。阿加莎•剋裏斯蒂是柯南•道爾之後最偉大的 偵探小說作傢，是偵探文學黃金時代的開創者和集大成者。一九七一年，英國女王授予剋裏斯蒂爵士稱號，以錶彰其不朽的貢獻。