What makes a serial killer? True crime writer Peter Vronsky discusses his new book Sons of Cain. Highlighted on this episode - Ted Bundy, The BTK Killer, HH Holmes, Jeffery Dahmer, The Golden State Killer, and Jack The Ripper. Vronsky shares his own story of going face to face with serial killer Richard Cottingham and other riveting history of serial killers in the U.S. and abroad.