Rules of Prey: Serial Killers Criminals typically commit crimes in a certain fashion. If they repeat the crime, they will most likely do so in a similar manner (Holmes and Holmes, 1). It is stated that each criminal has a MO (mode of operation) in which they conduct their criminal activities. This fact is the basis for profiling criminals. The profiling of serial killers yields specific classifications in itself. Louis Vullion, the serial killer known as the Maddog in John Sanford’s Rules of Prey, fits a specific type of serial killer profiled by Robert M. Holmes and Stephen T. Holmes in their book, Profiling Violent Crimes. The Maddo