After a house fire in Texas, suspicion lands on John Hummel when his family's brutally murdered bodies are discovered in the ashes, and he doesn't blink an eye. Now an inmate on death row, he grants a final interview weeks before his execution.

A missing Colorado woman's roommate claims she'll do anything to help find her, but investigators fear they may have a rare female psychopath on their hands. Later, a killer's angry outbursts could be real, or just an act put on by a manipulator.

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When police question a man in his pregnant ex-girlfriend and her young son's disappearance, they discover he has a terrifying capacity for violence. Later, a seemingly innocuous man searching for a missing girl could be a real-life monster.

A charming 20-year-old wants to help authorities with a murder investigation. He claims to have met one of the three victims and says he has no knowledge of the crime, but detectives suspect otherwise. Could this intellectual be hiding a dark side?

An unapologetic 14-year-old boy confesses to the murder of his best friend. Twelve years later, he's back in court with chance at a reduced sentence. Has this 26-year-old really changed? Or is he the same meticulous, cold-blooded killer he always was?

Residents of a quaint village are terrified when a local innkeeper and two others are found brutally murdered. Detectives in Maine must follow the depraved killer into the woods at night as he leads them to where he killed and buried a fourth victim.

A 50-year-old woman is found dead in her home. All that's left behind is a note that reads, "Chase me." But when detectives uncover the killer, they quickly discover they have come face to face with a remorseless psychopath.