On a November morning in 2015, Christopher Jackson waited for his fiancée, Angila Wilder, to pick him up from work as she always did. But this time, she didn’t show - and Christopher’s calls went unanswered. The police found what looked like a scene from a horror movie at their home. The backdoor kicked in. A bedroom splattered with blood. And a pregnant young woman violently stabbed to death.

On May 31, 2014, in the Milwaukee suburb of Waukesha, Wisconsin, two 12-year-old girls attempted to stab their classmate to death. Morgan Geyser and Anissa Weier’s violence was extreme, but what seemed even more frightening was that they committed their crime under the influence of a figure born by the internet: the so-called “Slenderman”. Yet the even more urgent aspect of the story, that the children involved suffered from undiagnosed mental illnesses, often went overlooked in coverage of the case.

On the morning of July 18, 2014, 41-year-old Florida State law professor Dan Markel dropped his boys off at preschool, hit the gym, and headed home to his quiet, tree-canopied neighborhood. Within seconds of pulling into his garage, two .38-caliber bullets fired from point-blank range were lodged in his brain. His brutal slaying defied explanation.

Colorado, 1976. When Reverend Mike Fuller and his beautiful wife, Sharon, arrive in the sleepy town of Rocky Ford, local residents think something’s off about the new couple. The God-fearing minister is gruff and cold, while charismatic Sharon has her husband wrapped around her finger.

Two days after Christmas, 2011, Russel Faria returned to his Troy, Missouri, home to find his wife, Betsy, dead, a knife still lodged in her neck. She had been stabbed 55 times in a brutal murder that would set off a chain of events leading to one man's wrongful conviction and imprisonment, another man's death, the revelation of a diabolical scheme, and an astounding miscarriage of justice left unresolved for another 10 years.

Growing up, Joanne suffered at the hands of a violent boyfriend and controlling relatives, as her mother lapsed into a downward spiral following the break-up of her marriage. But the consequences of her mother's lifestyle turned out to be worse than Joanne could ever have imagined. She already knew about the baby buried in a shallow makeshift grave next to the family plot. But when Joanne came across a red plastic bin in her mother's wardrobe in 2009, she realised that the family home held an even more sinister secret.

On April 20, 1999, Eric Harris and Dylan Klebold walked into Columbine High School in Littleton, Colorado. Over the course of minutes, they would kill 12 students and a teacher and wound 24 others before taking their own lives. For the last 16 years, Sue Klebold, Dylan's mother, has lived with the indescribable grief and shame of that day. How could her child, the promising young man she had loved and raised, be responsible for such horror? And how, as his mother, had she not known something was wrong?

In March 2015, Denise Huskins and her boyfriend Aaron Quinn awoke from a sound sleep into a nightmare. Armed men bound and drugged them, then abducted Denise. Warned not to call the police or Denise would be killed, Aaron agonized about what to do. Finally he put his trust in law enforcement and dialed 911. But instead of searching for Denise, the police accused Aaron of her murder. His story, they told him, was just unbelievable. When Denise was released alive, the police turned their fire on her, dubbing her the “real-life ‘Gone Girl’” who had faked her own kidnapping.

Everyone thinks they know the story of Milly Dowler. Haunting headlines about the missing schoolgirl splashed across front pages. The family's worst fears realised when her body was found months later. The years of waiting for the truth, only to learn that the killer, known to the police, lived just yards from where Milly had vanished. The parents subjected to horrific psychological torture at a trial orchestrated by the murderer.

In 1911 two British heiresses, Claire and Dora Williamson, read a brochure about a revolutionary fasting treatment that promised a lifetime of good health. The sanatorium in the village of Olalla, west of Seattle, was surrounded by a beautiful forest, sparkling waters and fresh air. The sisters agreed it sounded perfect and exactly the restorative holiday they needed. But within a month of arriving, under the supervision of Doctor Linda Burfield Hazzard, Claire and Dora began to realise the frightening truth – they were not patients but prisoners at the isolated sanitorium.

Although happily ensconced in a loving second marriage and a new family of quadruplets, Sheila Blackthorne Bellush never truly escaped the enslavement of her ex-husband, multimillionaire Allen Blackthorne, a handsome charmer - and a violent, controlling sociopath who terrorized her for a decade after their divorce. When Sheila was slain in her home, in the presence of her four toddlers, authorities raced to link the crime to Blackthorne, the man who vowed to monitor Sheila's every move in his obsessive quest for power and revenge.

Everyone from Wakarusa, Indiana, remembers the infamous case of January Jacobs, who was discovered in a ditch hours after her family awoke to find her gone. Margot Davies was six at the time, the same age as January—and they were next-door neighbors. In the twenty years since, Margot has grown up, moved away, and become a big-city journalist. But she’s always been haunted by the feeling that it could’ve been her. And the worst part is, January’s killer has never been brought to justice.

In and out of hospitals since birth, angelic nine-month-old Morgan Reid finally succumbed to what appeared to be sudden infant death syndrome. Morgan's Texas-born mother, Tanya, a nurse and devoted wife, pulled up stakes with her grieving husband, Jim, and moved on. It was the best way to put the past behind them. Until their son, Michael, a boy who by all accounts was terrified of his mother, began showing signs of the same affliction that stole the life of his baby sister....

At first, Linda Bergstrom's marriage to her husband James was idyllic. They were young and in love; he was about to enter the Navy and she was eager to start a family. But it wasn't long before the dream exploded. James became abusive and violent, prone to sudden bursts of anger, long silences, and unexplained disappearances. But Linda vowed to hold on, despite the pain and fear...and her disturbing suspicions about her husband's secret life.

Shelby Tebow is the first to go missing. Not long after, Meredith Dickey and her six-year-old daughter, Delilah, vanish just blocks away from where Shelby was last seen, striking fear into their once-peaceful community. Are these incidents connected? After an elusive search that yields more questions than answers, the case eventually goes cold. Now, 11 years later, Delilah shockingly returns. Everyone wants to know what happened to her, but no one is prepared for what they'll find....