It is 1842 and Jean Perevade finds himself totally entranced and bewitched by an attractive young lady he meets by chance at Therouanne in Flanders. Although he has done her a great favour, his initial advances to her are rebuffed and she disappears the next morning before Jean has time to even discover her name. After brooding for some months, he resolves to track her down. However, just when he thinks at last. He has obtained an audience with the lady of his dreams, he finds it is he who has been the quarry and been under constant watch, having been mistaken for his evil identical twin brother. However, he is reconciled to at least be a friend of the mysterious lady and help capture his infamous brother who is guilty of rape and murder. However, the twins are so alike how can the lady ensure justice for her murdered sister. The subtle difference has been there for all to see. Will the young lady realise what it is and be able to gather the evidence she needs in time for the trial at St Etienne near Lyon? Thereby, ensuring a guilty verdict and obtain justice for her sister.