Throughout the 70's and early 80's a mysterious and elusive counterfeiter known as "The Mall Passer" was sought by the US secret service for distributing hundreds of thousands of dollars worth of counterfeit bills across 38 states. The culprit ended up being James Mitchell "Mike" Debardeleben, a lifetime menace who beyond printing and passing counterfeit money (among other frauds and petty crimes) it turned out was a prolific and sadistic kidnapper, serial rapist and likely serial murderer who was in possession of records of victimization of women both voluminous and graphic. Most chillingly he had written a missive the FBI refers to as a "Manifesto of Sadism" in which he lucidly describes the "essence of the sadistic drive"
The Golden Age of Murder: A True Crime Podcast