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.

Lurking beneath the progressive activism and sex positivity in the 1970 to '80s, a dark undercurrent of violence rippled across the American landscape. With reported cases of sexual assault and homicide on the rise, the FBI created a specialized team - the “Mindhunters”, better known as the Behavioral Science Unit - to track down the country's most dangerous criminals. And yet narrowing down a seemingly infinite list of potential suspects seemed daunting at best and impossible at worst - until Dr. Ann Wolbert Burgess stepped on the scene.

Bonus material! Includes an excerpt from John Douglas and Mark Olshaker’s Obsession! Discover the classic behind-the-scenes chronicle of John E. Douglas’ 25-year career in the FBI Investigative Support Unit, where he used psychological profiling to delve into the minds of the country’s most notorious serial killers and criminals - the basis for the upcoming Netflix original series.

Twenty-two years in the FBI, 16 of them as a member of the Bureau's Behavioral Science Unit. Roy Hazelwood, like many investigators, has seen it all. But unlike most, he's gone further into the dark and twisted psyches of serial killers and sadistic sexual offenders and has emerged as one of the world's foremost experts on the sexual criminal. Acclaimed true-crime writer Stephen G. Michaud takes you into the heart of Hazelwood's work through dozens of startling cases, including those of the Lonely Heart Killer, the "Ken and Barbie" killings, and the Atlanta Child Murders.

In 1974, Dennis Lynn Rader stalked and murdered a family of four in Wichita, Kansas. Since adolescence, he had read about serial killers and imagined becoming one. Soon after killing the family, he murdered a young woman and then another, until he had 10 victims. He named himself “B.T.K.” (bind, torture, kill) and wrote notes that terrorized the city. He remained on the loose for 30 years.

Face-to-face with some of America's most terrifying killers, FBI veteran and ex-Army CID colonel Robert Ressler learned from them how to identify the unknown monsters who walk among us - and put them behind bars. Now the man who coined the phrase "serial killer" and advised Thomas Harris on The Silence of the Lambs shows how he has tracked down some of the nation's most brutal murderers. Join Ressler as he takes you on the hunt for America's most dangerous psychopaths. It is a terrifying journey you will not forget.

In the number-one New York Times best seller Mindhunter, John Douglas, who headed the FBI's elite Investigative Support Unit, told the story of his brilliant and terrifying career tracking down some of the most heinous criminals in history. Now, in Journey into Darkness, Douglas profiles vicious serial killers, rapists, and child molesters. He is straightforward, blunt, often irreverent, and outspoken, but takes pains not to glorify any of these murderers.

I order another bourbon, neat. This is the drink that will flip the switch. I don’t even know how I got here, to this place, to this point. Something is happening to me lately. I’m drinking too much. My sheets are soaking wet when I wake up from nightmares of decaying corpses. I order another drink and swig it, trying to forget about the latest case I can’t shake. Crime solving for me is more complex than the challenge of the hunt, or the process of piecing together a scientific puzzle. The thought of good people suffering drives me to the point of obsession.

Profiler Roy Hazelwood is one of the world's leading experts on the strangest and most dangerous of all aberrant offenders - the sexual criminal. In Dark Dreams he reveals the twisted motive and thinking that go into the most reprehensible crimes. He also catalogs the innovative and remarkably effective techniques that allow law enforcement agents to construct psychological profiles of the offenders who commit these crimes.

On November 15, 1959, in the small town of Holcomb, Kansas, four members of the Clutter family were savagely murdered by blasts from a shotgun held a few inches from their faces. There was no apparent motive for the crime, and there were almost no clues.

Joe Kenda investigated 387 murder cases during his 23 years with the Colorado Springs Police Department and solved almost all of them. And he is ready to detail the cases that are too gruesome to air on television, cases that still haunt him, and the few cases where the killer got away. These cases are horrifyingly real, and the detail is so mesmerizing you won't be able to turn it off.

In the most extraordinary journey Ann Rule has ever undertaken, America's master of true crime has spent more than two decades researching the story of the Green River Killer, who murdered more than 49 young women. Green River, Running Red is a harrowing account of a modern monster, a killer who walked among us undetected. It is also the story of his quarry -- of who these young women were and who they might have become.

John Douglas once again takes us fascinatingly behind the scenes, focusing his expertise on predatory crimes, primarily against women. With a deep sense of compassion for the victims and an uncanny understanding of the perpetrators, Douglas looks at the obsessions that lead to rape, stalking, and sexual murder through such cases as Ronnie Shelton, the serial rapist who terrorized Cleveland; and New York's notorious "Preppie Murder". But Douglas also looks at obsession on the other side of the moral spectrum: his own career-long obsession with hunting these predators.

One late spring evening in 2010, Shannan Gilbert - after running through the oceanfront community of Oak Beach screaming for her life - went missing. No one who had heard of her disappearance thought much about what had happened to the 24-year-old: She was a Craigslist escort who had been fleeing a scene - of what, no one could be sure. The Suffolk County police, too, seemed to have paid little attention - until seven months later, when an unexpected discovery in a bramble alongside a nearby highway turned up four bodies, all evenly spaced, all wrapped in burlap.

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....

To all appearances, Dennis Rader was a model citizen in the small town of Park City, Kansas, where he had lived with his family almost his entire life. He was a town compliance officer, a former Boy Scout leader, the president of his church congregation, and a seemingly ordinary father and husband. But Rader's average life belied the existence of his dark, sadistic other self: he was the BTK serial killer.

Dr. Helen Morrison has profiled more than 80 serial killers around the world. What she has learned about them will shatter every assumption you've ever had about the most notorious killers known to man.

Twenty-two years in the FBI, 16 of them as a member of the Bureau's Behavioral Science Unit. Roy Hazelwood, like many investigators, has seen it all. But unlike most, he's gone further into the dark and twisted psyches of serial killers and sadistic sexual offenders and has emerged as one of the world's foremost experts on the sexual criminal. Acclaimed true-crime writer Stephen G. Michaud takes you into the heart of Hazelwood's work through dozens of startling cases, including those of the Lonely Heart Killer, the "Ken and Barbie" killings, and the Atlanta Child Murders.

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.

Face-to-face with some of America's most terrifying killers, FBI veteran and ex-Army CID colonel Robert Ressler learned from them how to identify the unknown monsters who walk among us - and put them behind bars. Now the man who coined the phrase "serial killer" and advised Thomas Harris on The Silence of the Lambs shows how he has tracked down some of the nation's most brutal murderers. Join Ressler as he takes you on the hunt for America's most dangerous psychopaths. It is a terrifying journey you will not forget.

Ann Rule, who shared her own nerve-jangling account of unknowingly befriending sadistic sociopath Ted Bundy in The Stranger Beside Me, chronicles other fateful encounters with the hidden predators among us in this riveting collection, fifteenth in the best-selling series drawn from her personal files. First in line is a stunning case that spanned thirty years and took a determined detective to four states - ending, finally, in Alaska - where he unraveled not one but two murders.

Rachel Newhouse disappeared on the night of November 12, 1998. Only months later, in the same town, Aundria Crawford lost her life in an act of unimaginable violence. As authorities worked to find clues, parole officer David Zaragoza paid a routine visit to one of his charges - Rex Allan Krebs, a violent serial rapist who'd served only 10 years of a 20-year sentence. After sending Krebs back to jail for violating his parole, Zaragoza found a key chain belonging to one of the victims. An intensive search led to the gruesome discovery of buried remains near Krebs' secluded cabin.

For 31 years, a monster terrorized the residents of Wichita, Kansas. A bloodthirsty serial killer, self-named "BTK" - for "bind them, torture them, kill them" - he slaughtered men, women, and children alike, eluding the police for decades while bragging of his grisly exploits to the media. The nation was shocked when the fiend who was finally apprehended turned out to be Dennis Rader - a friendly neighbor...a devoted husband...a helpful Boy Scout dad...the respected president of his church. Written by four award-winning crime reporters who covered the story for more than 20 years, Bind, Torture, Kill is the most intimate and complete account of the BTK nightmare

Sheila Davalloo was young, attractive, and successful. When she started a new job at a cutting-edge research lab in Stamford, Connecticut, she met the man of her dreams. Nelson Sessler had no idea how violently Sheila would react when he began seeing a co-worker, Anna Lisa Raymundo. Sheila eliminated her rival in a bloody knife attack - and then turned her rage on another victim she saw as an obstacle to her passions.

The Anatomy of Motive offers a dramatic, insightful look at the development and evolution of the criminal mind. The famed former chief of the FBI's Investigative Support Unit, John Douglas was the pioneer of modern behavioral profiling of serial criminals. Working again with acclaimed novelist, journalist, and filmmaker Mark Olshaker, and using cases from his own fabled career as examples, Douglas takes us further than ever before into the dark corners of the minds of arsonists, hijackers, bombers, poisoners, serial killers, and mass murderers.

Over a three-decade span, more than 20 women - many teenagers - died mysteriously in the small towns bordering Interstate 45, a 50-mile stretch of highway running from Houston to Galveston. The victims were strangled, shot, or savagely beaten.

This riveting inside story of the intense search for the Salt Lake City teenager who was kidnapped from her bed reveals never-before-told details of the largest investigation in Utah state history. Paced like a thriller, this true account moves between the parallel stories of the searchers and the abductor. Going beyond a mere eyewitness account, the book includes information culled from interviews with more than 150 people involved in the search and investigation, notes from family meetings, and memos from law enforcement officials.

In 1963, with the city of Boston already terrified by a series of savage crimes known as the Boston Stranglings, a murder occurred in Belmont, just a few blocks from the house of Sebastian Junger's family, a murder that seemed to fit exactly the pattern of the Strangler. Roy Smith, a black man who had cleaned the victim's house that day, was convicted, but the terror of the Strangler continued.

After Jack the Ripper and before Son of Sam there was only one name their equal in terror: the deadly, elusive, and mysterious Zodiac. Beginning in 1968 the hooded mass murderer terrified the city of San Francisco and the Bay Area with a string of brutal killings. A sexual sadist, his pleasure was torture and murder.

Before Adam Walsh there were no faces on milk cartons, no Amber Alerts, no National Center for Missing and Exploited Children, no federal databases of crimes against children, no pedophile registry. His 1981 abduction and murder, unsolved for over a quarter of a century, forever changed America.