Days before Thanksgiving, a small Philly suburb is rocked by the murder of 67-year-old Alice Hufnagle. Investigators run down a litany of suspicious characters on the road to unmasking the beloved matriarch's killer.

In December 1998, the body of telemarketing manager David Stevens is found in a torched car in La Jolla, California, the victim of homicide. Detectives encounter a rogue's gallery of suspects and outlandish leads on their way to finding the killer.

A young woman is found murdered in her Portland, OR apartment on Christmas Day and investigators soon learn the terrifying truth about her vicious killer.

Though Ronald Hawkins and Candace Sims knew that their son Robbie was different from an early age, they were unprepared for the violent act that Robbie would commit, a crime that shook the nation. Now they talk about it all on camera.

Danyall White tells the true story of her brother Richard. Danyall always thought he was a prankster who told stories. But when his stories started getting more and more violent, she slowly realized that her brother was hiding a monstrous secret.

Cathy thought she had found the man of her dreams in Peter Tobin. But by the time she discovered his dark secret, it was too late. How would she keep herself and her son alive long enough to escape one of the most evil men in modern history?

To Kevin Currie, Mormon prophet Jeffrey Lundgren was more than a spiritual leader, he was a brother. But before long, Kevin realized that this Man of God was really a devil in disguise with an evil plan.

Bernadette was 17 when her boyfriend, Brian Sugrim, told her he had murdered someone. But she didn’t believe him. Only years later would she realize the true evil that Brian was capable of. Will a monster get away with murder?

Sheila Janutolo dreaded being alone with her husband Jim Cruz. Over the years, she had learned to fear him and his violent temper. But when she got a call that he'd been arrested for a ghastly crime, she was certain police had the wrong man.

Shelly Lietz had been afraid of her son ever since he was four years old. She knew she saw something evil in his eyes that scared her. As he got older and more violent, that fear crippled her, eventually making her a prisoner in her own home.

Jill Garrison thought her second go-around with love would be one that lasted the rest of her life. But then her quiet town suddenly began to be preyed upon by a nightmarish killer. Jill didn't realize that she had invited a monster into her home.

Linda Wittmier and Terry Jo Howard both fell in love with James Michael Randall. And both suffered when they discovered the monster that lurked inside him. But they never realized how lucky they were to survive his twisted sexual desire to kill.

As a young boy, Michael Blanco had seen his mother do violent things that seemed straight out of the movies. But he never once doubted that she did those things to keep their family safe - until the day he learned the truth.

Charles Sexton was taught that his father, Eddie, was God. At first, he and his siblings were willing and loyal disciples, but as the family descended into madness, Charles discovered that in the Sexton family, crossing his parents meant death.

When Reginald Brooks began acting strangely, Beverly Stephens worried that her husband's bizarre behavior was a warning sign that something wasn't right. But she never suspected there was a killer lurking inside him.

When Brian Cargill divorced his wife, Kimberly, he thought it was the end of the worst time of his life. Instead, he found himself in a desperate battle to save his son, Jamie, from her deadly wrath.