A savage predator goes on a homicidal rampage with a savage triple murder along with an abduction of two young siblings from their home in the middle of the night. The children quickly decide they will do whatever is necessary to survive.

The discovery of four women's bodies on Gilgo Beach was just the beginning. But who is the Long Island Serial Killer? Investigators uncover multiple suspects and shocking theories, as they race to capture this prolific killer before he strikes again.

In 1984, a slew of brutal hammer attacks leaves a Colorado community in fear. It takes nearly 40 years before a serial killer is brought to justice.

After a young couple goes missing, detectives find a clue leading them to a strange storage container in the middle of 95 acres, and what's inside unlocks the secrets of a monster hiding in plain sight.

The murder of James Byrd, Jr. throws his family into turmoil as law enforcement investigates one of the most gruesome hate crimes in U.S. history.

[The Keddie Murders] A mother and three teens are murdered in the remote town of Keddie, California. Despite a trail of suspects and illicit activity, no one was ever brought to justice. But recently discovered evidence may be the key to finally cracking case.

[Los Angeles Serial Killer] A lone survivor is the only witness who can help police track down a serial killer known as the Grim Sleeper, who preys on women in South Central Los Angeles. After decades of searching, police hone in on an unlikely suspect.

In the 1970s, a serial rapist is on the loose in northern California. As his reign of terror over the community wanes, police discover he isn't just a serial rapist, he's a serial murderer who has been killing people all over California.

One summer night in 2007, the Petit family is woken up by two strangers in their quiet Connecticut home. Suddenly, these four family members find themselves being held hostage and in a fight for their lives.

In Philadelphia, police make a horrific discovery 18 months after a woman goes missing. The police pursue the woman's killer, but he always manages to stay one step ahead of the law.

In 1988, a young woman is found murdered in her Modesto, CA, home, leading police to investigate the strife and infidelity in her marriage. A surprising witness eventually comes forward.

When a widower and father of three is found murdered outside his Long Island home, police have reason to look into shady business dealings as a possible motive. Then, a tip leads to three unlikely suspects, exposing dark family secrets.

Two days before the new millennium, the Freeman family trailer is burned to the ground. The couple's remains are found with bullets to the head, but their teenage daughter and her friend are missing.

In 2011, a husband returns home to find his wife dead on the living room floor. He tells first responders she committed suicide, but it was murder. Police zero in on the husband and what unfolds is one of the most outrageous tales in recent history.

[Mystery in Texas] In 1995, 16-year-old Adrianne Jones is found shot to death in Grand Prairie, Texas. A model student and athlete, there seems to be no reason for her death. Police investigate boyfriends, neighbors and local troublemakers, but don't have any strong suspects. The case grows cold, until nine months later when a game of Truth-or-Dare leads to a startling confession and an over-achieving relationship that went murderously awry.

When a young family vanishes from their Southern California dream home, friends and family are left with dozens of unanswered questions. Authorities suspect they fled the country, until an unlikely source uncovers the truth.

A 12-year-old girl goes missing on her way to school in Oregon City, Oregon. The police investigation offers little in the way of leads. Then, a second girl disappears.

The morning of his anniversary, Mike Williams goes duck hunting. When he fails to return home that afternoon, an all-out search commences. But it's only the beginning of a sordid mystery that will take close to 20 years to solve.

When three women from three different decades meet their death or go missing under mysterious circumstances, authorities are forced to examine the one thing they had in common: they all fell in love with the same man.

In July of 2010, NBA star and family man Lorenzen Wright goes missing outside of Memphis, TN. When his dead body is discovered in the woods, investigators find that this case is far from a slam dunk.

On a snowy night in January 1980, college student Helene Pruszynski disappears after reaching her final bus stop. When her body turns up in a snowy field, police launch a long and frustrating investigation that pushes family and detectives to the brink of hopelessness. Their hope is revived when they discover that cutting-edge forensic genealogy may hold the key to finding Helene's murderer.

In the summer of 2003, the Iron Range of northern Minnesota is a peaceful community where parents let their kids play outside on their own without a second thought. But when five-year-old LeeAnna Warner vanishes without a trace, investigators do a deep dive into the quaint community and realize that some of the familiar faces in the neighborhood may be hiding some disturbing secrets that may never fully be uncovered.

During an armed robbery, a father of three is fatally shot, but for 23 years, another family questions if the wrong man is behind bars.

In the '60s and '70s, a serial killer stalks young women in New Jersey; at the same time, three women in New York City are sadistically murdered; no one expects that one man is causing the mayhem, let alone a seemingly ordinary father of three.

When a vivacious young escort, Shannan Gilbert, vanishes on Long Island's south shore in 2010, her disappearance leads police to discover the bodies of ten other victims dumped by a serial killer.