On February 13, 2017, two Indiana teenagers, Abigail Williams, 13, and Liberty German, 14, went for a walk in the woods near the abandoned Monon High Bridge. They never returned home.

Roger and Penny Scaggs seemed a poster couple for family values. Evangelical Christians living in booming Austin, Texas, in the mid-1990s, they were respected leaders in their church and community. As Roger diligently worked his way up the high-tech corporate ladder, Penny kept a pristine home and coached similarly devout young women on how to be perfect wives. But on a windy March evening, this godly woman met the devil head-on.

In 2015, Mary Yoder returned home from the chiropractic center that she operated with her husband, Bill, complaining that she felt unwell. Mary, health-conscious and vibrant, was suddenly vomiting, sweating, and weak. Doctors in the ER and ICU were baffled as to the cause of her rapidly progressing illness. Her loved ones - including Bill and their children, Adam, Tamryn, and Liana - gathered in shock to say good-bye. In the weeks that followed Mary's death, the grief-stricken family received startling news from the medical examiner: Mary had been deliberately poisoned with colchicine.

On June 25, 1973, a seven-year-old girl went missing from the Montana campground where her family was vacationing. Somebody had slit open the back of their tent and snatched her from under their noses. None of them saw or heard anything. Susie Jaeger had vanished into thin air, plucked by a shadow. As days stretched into weeks, and weeks into months, Special Agent Pete Dunbar attended a workshop at FBI Headquarters in Quantico, Virgina, led by two agents who had hatched a radical new idea: What if criminals left a psychological trail that would lead us to them?

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.

In May 1971, Pam Jackson and Sherri Miller were two seventeen-year-olds driving to an end-of-the-school-year party in a rundown Studebaker Lark, when they seemingly disappeared off the face of the earth. Police back then didn't do enough to try and find them. Investigators thirty years later did too much. Two families endure decades of pain as they await answers of what happened to their girls. When a third family is pulled into the mystery, they quickly learn their nightmare is just beginning.

David loved Cindy and was loved in return. Or so he thought. The troubled young man clung to his new love and dreamed of their future together. So begins the chain of events that was to evolve into a horror of terrifying proportions. Jack Olsen, best-selling author of Son, now reveals the details of a true-life romance gone hideously awry.

Detective Derek Mois wasn’t sure what he was dealing with when in March 2008 he walked into a home in an affluent Omaha neighborhood and was confronted with two bodies. Both had been murdered with kitchen knives plunged into their throats. Who would do something so vile, and why? Lacking answers, Mois and other detectives working the case were stumped. Five years later, a strikingly similar crime occurred in which two more victims were brutally murdered with knives expertly thrust into their jugular veins.

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....

In September of 1990, in the Cleveland suburb of Shaker Heights, sixteen-year-old Lisa Pruett was on her way to a midnight tryst with her boyfriend when she was viciously stabbed to death only thirty feet from the boy's home. The murder cast a palpable gloom over the upscale community and sparked accusations, theories, and rumors among Lisa's friends and peers. With a fresh perspective and painstaking research, James Renner reconstructs the events leading up to and following that heartbreaking night. What emerges is a portrait of a community seething with dark undercurrents.

In the lovely town of Pleasant Valley in upstate New York, the maple trees were ablaze with fall's blood-red color. The air was crisp. And a woman named Susan Fassett left her weekly choir practice at a church - when a killer emerged from the shadows and mercilessly gunned her down.

In the early morning of October 18, 1986, Cherie Wier’s life collapses when her teenage son takes the life of her beloved husband. For years, Cherie grapples with events preceding and following the crime, struggling to overcome the consuming grief she suffers from her loss and the difficulty she faces as she attempts to forgive her son. The courtroom accounts of gruesome details and the shocking testimonies from experts only add to Cherie’s yearning to make sense of the crime. She is tormented, wanting to know why the tragedy happened, and if there was anything she could have done.

No Stone Unturned recreates the genesis of NecroSearch International: a small ,eclectic group of scientists and law enforcement personal, active and retired, who volunteer their services to help locate the clandestine graves of murder victims and recover the remains and evidence to assist with the apprehension and conviction of the killers.

On a snowy winter evening in 1982, 21-year-old Mary Brown accepted a ride from a handsome stranger in the resort town of Breckenridge, Colorado. The trip ended with her brutally beaten and raped. Mary survived, but her predator's violence had only just begun. After 10 years in prison, Tom Luther was released a far more vicious criminal. Soon, from the Rockies to West Virginia, like Ted Bundy, Luther enticed a chain of women into his murderous trap.

In this unprecedented deep dive into inner-city gang life, Mark Bowden takes listeners inside a Baltimore gang, offers an in-depth portrait of its notorious leader, and chronicles the 2016 FBI investigation that landed eight gang members in prison.