Though Ronald Hawkins and Candace Sims knew that Robbie was different from an early age, they were unprepared for the violent act that Robbie would commit, a crime that shook the nation.

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.

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.

As a child, Pam Jacobs spent years of her life on the run from the law. But she had no idea that her father, Charles Sinclair, was a wanted man until the day the FBI caught up with them.

When James Henslee realizes he is the police's prime suspect, he can't believe it but he attempts to convince them that someone he had once looked up to was the one capable of murder.

Ronald and Patty had always seen the signs that their older brother, Bernard Eugene Giles, had a darker side, but when Gene finally let loose the monster lurking inside, they couldn't help but wonder how things had gone so wrong.

When Clare Bradburn's ex-husband, Ed, suddenly confesses to his crime after 26 years, she thinks she finally has justice, and that the nightmare she lived for decades would end; she never expects that her nightmare would continue.

When Tim Kreider discovers proof that his son, Alec, was responsible for a horrific crime, he knows what the right thing to do is; his instincts as a father tell him something else.

When Elizabeth Flores was a child, her sister, Louise, tried to shield her from a horrible family secret. But when Louise met David Turpin, that all changed. How did Louise go from running from monsters to becoming one herself?

As a child, Corey Breininger's stepmother, Judith Hawkey, coerces him into doing something horrible; he keeps her deadly secret for years, too afraid to tell anyone the truth.

Robert Foust contemplates killing his son, Aaron, as the only way to prevent Aaron from becoming a murderer; instead, Robert chooses to put himself and his son in God's hands, and God's plan makes him question everything.

Joylynn Martinez sometimes wakes up and cannot remember what happened the night before; she thinks she must've had too much to drink, never suspecting that her husband, Robert Howard Bruce, was responsible, and that he was just getting started.

As a boy, Travis Spencer always told himself that the cruel pranks his older brother, Timothy, played on him were ultimately harmless. He never suspected that his brother was using him to practice methods of torture that would be used on others.

Michele Ward was always glad that her husband, Richard Daniel Starrett, didn't mind her frequent trips to visit her parents. She never guessed that he sent her away because his sick perversion was getting harder and harder to hide.

It has been more than 25 years, yet Joyce Alexander is still terrified of her son, William Patrick Alexander; she fears he holds her responsible for his horrifying crime, and is convinced he is plotting his revenge from prison.

Edward Pehowic harbors dark secrets before he marries Robin Healey, and she'd catch only glimpses of her husband's dark side, but when she finally escapes from him, she realizes just how evil he is.

John Duck spends his entire life fearing the day his brother Kevin would finally kill someone, but when John discovers his brother is actually a murderer, he still isn't ready to face that Kevin had been born a killer.

Timothy Bass had gotten away with murder for decades, telling his wife, Gina, that he enjoyed working the night shift to make extra money; Gina believed him until she uncovered his secret and was left wondering what evil her husband had done.

It never occurred to Shirley Gaskins that the father she adored could be one of the most prolific serial killers in America, but the more people vanished without explanation, the harder it was to deny.

Richard and Ryan Girgis knew their father, Magdi, was not a particularly good father, but when their family is torn apart, the brothers feel they knew he was evil all along.

Jack Roy Spillman starts collecting wolf memorabilia, and his sisters think it's an odd hobby; when they learn of horrific things he's done, they realize some people may have been right when they called him more animal than human.

When Terra Newell met her mother's new boyfriend, she sensed John Meehan was no good. Debra Newell never suspected her new man was secretly plotting to destroy her and her family. And Terra never imagined she would ultimately be forced to kill.

As Christina Hildreth unwittingly helped Shawn Grate clean up his first crime scene, she didn't realize what she was doing. Once police were banging on her door while she was trapped with a madman, she understood the situation was direr than she realized.

Teri Knight spent weeks driving cross-country, desperately searching for the secret her ex-husband, Manuel Gehring, took to his grave. It took years before a stranger finally solved the mystery that haunted Teri ever since learning Manuel died in prison.

When Shirley Furgala helped her mother, Betty Lou Beets, drag a dead body to the yard and bury it, she knew her own life might be in danger if she refused to help. What Shirley didn't know was this wouldn't be the last time her mother would ask for help.