Twenty Years a Detective in the Wickedest City in the World by Wooldridge

In presenting this work to the public the author has no apologies to make nor favors to ask. It is a simple history of his connection with the Police Department of Chicago, compiled from his own memoranda, the newspapers, and the official records. The matter herein contained differs from those records only in details, as many facts are given in the book which have never been made public. The author has no disposition to malign any one, and names are used only in cases in which the facts are supported by the archives of the Police Department and of the criminal court. In the conscientious discharge of his duties as an officer of the law, the author has in all cases studied the mode of legal procedure. His aim has been solely to protect society and the taxpayer, and to punish the guilty.