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 describes how her brother, Richard, tells increasingly violent stories until she comes to realize he is keeping a monstrous secret.

Cathy thought she had found the man of her dreams in Peter Tobin; but by the time she uncovers his dark secret, it was too late.

Kevin Currie is a devout follower of spiritual leader Jeffrey Lundgren, then he comes to realize Lundgren is really a devil in disguise who has hatched an evil plan.

When 17-year-old Bernadette's boyfriend, Brian Sugrim, told her he had murdered someone, she didn't believe him until years later.

Sheila Janutolo dreads being alone with her husband, Jim Cruz, who has a violent temper, but when she gets a call saying he's been arrested for committing an appalling crime, she is certain the police have the wrong man.