What happens when a jealous lover turns into an enraged killer? From impulsive crimes of passion to a terrifying revenge crime spree, Dr. Stone unravels how the psychology of love can become the psychology of murder.

What happens when delusion, obsession, and jealousy collide? What can explain this relentless drive, and what triggers violence in the mind of a stalker? Neuro-psychology is explored on the cases of four notorious stalkers.

Delusional minds are profiled using cutting-edge science that may finally reveal the neurological cause of schizophrenia.

Dr. Stone's scale of evil has decoded the complex psychology of the country's most notorious criminals. But can it be used to reveal new clues for unsolved crimes?

Dr. Stone unearths the psychology of persuasion to learn why cult members can become active participants in evil.

From Charles Whitman, the Texas clock tower sniper, to Charles Starkweather, the real "Natural Born Killer," science reveals new clues into the psychology behind these seemingly senseless crimes. What links these acts of evil?

With groundbreaking science on the origins of malignant narcissism, Dr. Stone profiles murderers whose need for glory and control led them to incredible evil to see what causes some people to choose murder as a means to notoriety.

What lies at the intersection of evil and intelligence? Dr. Stone, armed with new scientific discoveries on early brain development, analyzes Kemper, Kaczynski, and Kraft to find out what made these killers' use their cunning for crime.

Dr. Stone probes the science of revenge to profile revenge killers, looking for clues that might shed light on their motives.

Michael Stone analyzes four of the 20th century's most deadly cult leaders: Shoko Asahara, Adolfo Constanzo, Charles Manson and Jim Jones.

Retrace the investigation of Charles Manson and how he convinced young, middle-class men and women to commit unthinkable acts of violence. Dr. Stone speaks with two of Manson's followers to gain insight into his power.

Killers' minds make irrational connections that result in horrifying acts of evil. Dr. Stone explores the nature of delusions and how they impact the twisted minds of killers that create false realities that lead to violence.

Dr. Stone explores the possibility for killers to reform and change their lives. He uses his scale to determine if evil is a constant state or if redemption is possible.

Gangs lure members with promises of respect, money and power. From armed robbery to murder, they are responsible for some of the most brutal crimes. Forensic psychiatrist, Dr. Michael Stone examines the world's deadliest gangsters.

Brutal killers. What motivates their heinous crimes? In this hour, Columbia University forensic psychiatrist Dr. Michael Stone uses face to face one-on-one interviews to gain insight into the motives, methods and minds of murderers.

How do you track a killer? In this hour, Dr. Michael Stone, forensic psychiatrist at Columbia University, follows in pursuit of evil. He examines the process involved in identifying and capturing vicious killers.