XYZ by Anna Katharine Green will shock you to your very core with its twists, turns, and dark and spooky secrets. An unnamed detective must uncover the mystery of a counterfeiting crime, without getting implicated in the process. Excerpt: "Sometimes in the course of his experience, a detective, while engaged in ferreting out the mystery of one crime, runs inadvertently upon the clue to another. But rarely has this been done in a manner more unexpected or with attendant circumstances of greater interest than in the instance I am now about to relate."