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.

George and Margaret Keller never suspected that the man terrorizing their city could be a member of their own family. As it dawns on them that their son is hiding a sinister secret, they must decide whether or not to turn him in.

As a boy, Eric Witte's father taught him to protect his family. But as his father grows increasingly violent, Eric realizes that he is the evil his family needs protection from.

Wallace Jeffs was raised to believe that his half-brother, Warren, would guide his family to salvation. But when his nephew reveals Warren's true nature, Wallace will have to choose between loyalty to his family or to his church's new prophet.

Sherry Shafer never had a good relationship with her younger brother, Brian Britton, but she never expected to lose everything because of him. Today, all she has left is the fear that one day he will return to finish what he started 26 years ago.

Dennis Ryan grew up believing that his father’s violent teachings were preparing him to save the lives of everyone in their farmhouse. But by the time Dennis discovers the horrible truth, it is too late-he has already gone too far.

Tiffany Shore grew up knowing that her father was evil, but she still kept his secrets. When Tiffany finally escapes him, she is devastated to discover that has committed far more heinous acts than she ever imagined or knew about.

Sean Lewis isn't surprised to hear his brother, Patrick, has been arrested again. But this time, Sean learns that every time he had helped his brother get out of some jam he was unwittingly helping a monster continue living a secret double life.