Robert Blair was about to knock off from a slow day at his law firm when the phone rang. It was Marion Sharpe on the line, a local woman of quiet disposition who lived with her mother at their decrepit country house, The Franchise. It appeared that she was in some serious trouble: Miss Sharpe and her mother were accused of brutally kidnapping a demure young woman named Betty Kane. Miss Kane's claims seemed highly unlikely, even to Inspector Alan Grant of Scotland Yard, until she described her prison -- the attic room with its cracked window, the kitchen, and the old trunks -- which sounded remarkably like The Franchise. Yet Marion Sharpe claimed the Kane girl had never been there, let alone been held captive for an entire month! Not believing Betty Kane's story, Solicitor Blair takes up the case and, in a dazzling feat of amateur detective work, solves the unbelievable mystery that stumped even Inspector Grant.

約瑟芬·鐵伊，1897年生於蘇格蘭因弗內斯，就讀於當地的皇傢學院。之後，在伯明翰的安斯地物理訓練學院接受三年訓練，然後開始物理訓練講師的生涯。後來，她辭去教職照顧她住在洛剋耐斯的父親，並開始寫作。

這位英籍女作傢，是20世紀30年代以來，推理史最輝煌的第二黃金期三大女傑之一，也是其中最特立獨行的一位。和她齊名的阿加莎·剋裏斯蒂、多蘿西·榭爾斯都是大産量、行銷驚人的作傢，鐵伊卻窮盡一生之力隻寫瞭八部推理小說，八部水準齊一的好小說——是推理史上極少數一生沒有任何失敗作品的大師。