The Diddler is a novel written by A. E. Senter. The book is a mystery thriller that revolves around a serial killer who is known as ""The Diddler"". The story is set in the early 1900s in New York City. The main character of the book is Detective Sergeant Dan Madden, who is assigned to catch the killer. The Diddler is a notorious criminal who preys on young women. He is known for his ability to charm and manipulate his victims before eventually killing...