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.

Six-year-old beauty queen JonBenét Ramsey is found murdered in her Boulder, Colo., home in 1996, and investigators try to determine whether she was killed by an intruder or by a member of her own family.

In 1984, the body of a 14-year-old girl turns up on the beach in San Diego and police think it relates to the murder of another teen; a clue yields an unbelievable suspect.

A senseless murder rocks an African-American neighborhood in 1970s Detroit; police arrest suspects who are ultimately convicted of murder, but 47 years later, the truth finally emerges to right history's wrongs.

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

A double murder involving the family of a federal judge prompts an investigation of epic proportions by the FBI, U.S. Marshals and Chicago Police Department; at the end of the trail, law enforcement personnel learn the death count may climb higher.

After doting mother Cheryl Coker vanishes from Riverside, Ohio, numerous searches turn up nothing; as police take a closer look at the case, they uncover some disturbing information.

Police question suspects in the inner circle of Jackie Galloway, a woman found strangled and bound with ritualistic knots; a chance encounter with a prowler leads them to the shocking discovery of a budding serial killer.

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.

NBA basketball player Lorenzen Wright goes missing outside of Memphis, Tenn., then his body is discovered in the woods, and investigators find out this case is far from a slam dunk.

Right before Thanksgiving, two masked gunmen reportedly invade a couple's home and kill the husband; with few leads, police use ballistics, forensics and neighborhood gossip to solve this cold-blooded murder.

Gallaudet University is the premier college for the deaf in the United States, but this haven of higher learning is turned upside down after two students are murdered in their dormitory rooms.

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.

In 1969, a woman is found murdered in Los Angeles, but her identity is a mystery; for decades, police investigate hoping to put a name to the face and find her killer; the one lead that comes up over and over leads them to Charles Manson.

In 1980, Tim Hack and Kelly Drew go missing from a small Wisconsin town, then their bodies are found in a field; a woman comes forward nearly 40 years later to help solve the so-called "Sweetheart Murders" of Hack and Drew.

In York, Pa., race riots claim the lives of an African-American mother and a young, white police officer; their deaths are largely forgotten until 30 years later when their cold cases are reopened, revealing the city's dark past.

In the summer of 2000, bags full of body parts start appearing all over the San Francisco Bay Area; investigators follow the trail of grisly clues to a secret cult carrying out a sinister scheme.

In 1992, a 19-year-old woman is brutally assaulted outside of Desert Hot Springs, Calif.; miraculously, she escapes but lives in constant fear that her assailant will find her again one day, not realizing she has survived a serial killer.

In 1998, a gifted Philadelphia graduate student is found murdered in her bed, triggering a hunt for her killer.

Cambodian genocide survivor Dr. Haing Ngor wins an Oscar for his role in "The Killing Fields," then he's gunned down outside his Los Angeles home, and the LAPD investigates a web of political intrigue, revenge and street gangs to uncover the truth.

In the early 1970s, Washington D.C. is terrorized by a cunning killer who abducts and murders six young African American girls; police and the community are outraged by the serial killings that target young children in their own neighborhoods.

"Betrayed" reveals chilling stories of chasing the American dream and how the veneer can dramatically crumble, ending in murder at the hands of a trusted family member, co-worker, lover, or friend. The cases of deception are told through the lens of the fictionalized, first-person perspectives of the victims. As investigators, family, and friends peel back the layers and facts of each case, the otherworldly narrator already knows where the trail ends. The narrator guides viewers through various relationships, raising suspicions about who will commit the ultimate betrayal.

In this eight-episode series, viewers hear directly from detectives who investigated cases that haunt them to this day. These true-crime stories -- from mysterious vanishings to twisted family murders -- are the "unforgettable cases that disrupt law and order, and keep authorities up at night," says Investigation Discovery.

"Accident, Murder, or Suicide" investigates the deaths that are just a little bit too mysterious. It explores the unbelievable true stories in this hourlong program. Each episode retraces the investigation from the start to the end. Investigators take viewers through the twists, turns, and unexpected surprises as they dissect the red flags, show evidence, and point out the strange behavior that puts everything into question.

For more than 25 years, "Dateline" has brought viewers investigations into some of biggest mysteries in America. This entry in the franchise takes a second look at some of the most mysterious cases of recent history. Hosted by Emmy-winning journalist Craig Melvin, the show explores the stories through firsthand accounts told by people who are close to the crime, including investigators who dedicated their time to the cases and family members who are still trying to confront the tragedies that befell their loved ones.

Investigation Discovery joins forces with reporters from People magazine to tell stories of the destructive effects cults have on members and their families. Lured by false promises, everyday people are caught up in terrifying webs of abuse, deception and manipulation, building to pivotal moments when blind worship leads to violence and even death. Each hourlong episode offers an in-depth exploration of a twisted American cult, from world-famous Jonestown to smaller but equally disturbing sects of depravity. People's journalists interview survivors who managed to escape a cult, exposing stories of power-crazed leaders who use mind control, sex, and daily rituals to dominate followers.