故事简介(英文书籍)
Carla is engaged to be married but she is afraid that the fact that her mother killed her father will poison her husband's love for her, as he may fear that she has inherited a husband-killing tendency. Moreover, Carla remembers that her mother would never lie to her to hide an unpleasant truth and her mother told her she was innocent through a letter. That is enough for Carla but she wants Poirot to prove her mother's innocence to her husband to be.