Allan Pinkerton 
The Expressman and the Detective [EPUB ebook] 

During the greater portion of a very busy life, I have been actively engaged in the profession of a Detective, and hence have been brought in contact with many men, and have been an interested participant in many exciting occurrences. The narration of some of the most interesting of these events, happening in connection with my professional labors, is the realization of a pleasure I have long anticipated, and is the fulfillment of promises repeatedly made to numerous friends in by gone days.