Even the world's most depraved murderers were once only known as somebody's neighbor or someone's son. What turned these people into killers? And why is everyone so fascinated with them? In one chilling chapter after another, this book profiles a terrifying succession of homocidal maniacs. It takes readers inside the minds of the people who committed the world's most notorious and horrendous crimes. Are they inhuman beasts beyond compassion, or human beings just like us who simply crossed a line and could not find a way back? Each story stands alone as a frightening tale. Drawn together in this one volume, "Serial Killers and Mass Murderers" present a fascinating investigation of the dark side.