NYPD detectives discover a bullet-pierced body stuffed into the trunk of a car and quickly find themselves drawn into a dark tale of brotherhood, backstabbing and betrayal.

A frantic 911 caller informs police he's found a family member dead; at first, it looks like a case of suicide, but a deeper dig reveals a secret world of sex tapes, broken promises and unfathomable motives.

A homeowner is found dead in a driveway, riddled with bullets; the claims of a family member who allegedly witnessed the brutal attack raise more questions than answers.

While performing a welfare check, police stumble across a brutalized body hidden inside a garden shed; while this is a shocking find, another family member had perished on this same property just two days prior to the welfare check.

While carrying out a welfare check on Thanksgiving Day, police discover a triple homicide; to unmask the killer, detectives must uncover a victim's secrets and examine a hidden world of disinheritance, rage and dark accusations.

In Logan, Ohio, investigators receive word someone has been kidnapped from their job at the bank in a car that resembles a police cruiser; eventually, detectives discover a very personal connection between the victim and the kidnappers.

In Pueblo, Colo., police are called to a horrific scene where a fire reveals the charred remains of a body; as detectives work to track down the killer, their investigation uncovers cracks in the foundation of a large, multi-generational family.

In Ore City, Texas, firefighters extinguish a burning truck to reveal the charred remains of a human corpse inside; it soon becomes apparent that this fiery incident was no accident.

Responding to a home invasion, police find one family member has been killed while another has been left in critical condition; it doesn't take long for detectives to start suspecting the culprit could be someone very close to home.

Confronted with a grisly Valentine's Day surprise, police find a bullet-riddled body in a family's home; the usual suspects have alibis, forcing detectives to follow a trail of secrets, manipulation and betrayal to arrive at the truth.

In southern Oregon, a weekend in the woods turns into a nightmare for the family of a local businessman; over the weekend, open marriages and forbidden relationships lead to a watery grave for one of the campers.

In Bigfork, Mo., two random-appearing murders turn out to be connected in a shocking way.

In the Pacific Northwest, a family appears to have it all until a stash of guns and a secret video reveal the face of a diabolical killer.

In the Blue Ridge Mountains of North Carolina, community pillars are pulled into a quagmire of affairs, abuse and embezzlement leading to murder.

In Montgomery, Ala., high society plays host to an uninvited party guest; murder is on the menu when one family's distrust and finger pointing lead detectives on a cross-country trek for a killer.

In Honesdale, Pa., a family copes with teen pregnancy, addiction and heartache, then someone from the past stirs the pot to bring about a murder.

In Orange County, Calif., a fortunate family's luck runs out when murder comes knocking.

In Little Washington, N.C., old money combines with a get-rich-quick attitude to put a family in jeopardy.

In Nebraska, a once-happy family is frayed by anger and jealousy when an illicit affair comes to light, and a tattoo seals the fate of more than one member of this family.

In Dallas, a couple's love story brings together a large blended family in harmony, until jealousy and greed reveal that one family member's true colors include blood red.

A Texas town is named after a family of farmers venerated by the community, but infighting among the family members leads to murder.

From blushing brides turned cold-blooded killers to smitten grooms with shocking dark sides, "Fatal Vows" examines the criminal psychology behind deadly divorces. Guiding viewers through actual stories of love gone wrong are psychotherapist Stacy Kaiser and forensic/clinical psychologist Dr. Brian Russell, who examine each couple to better understand how the marriage turned from flawed to fatal. Stylized re-enactments are supported by interviews with family, friends, law enforcement, and potential victims of the crime, while Kaiser and Dr. Russell provide analysis on unions that break down until divorce and murder collide.

Actual murder cases from the 1950s and '60s get sleek, cinematic treatment in this series, transporting viewers back to a pre-forensics era when sometimes it was more about how suspects looked than what they did that determined guilt. Narrative by a fictional bystander -- who "knew" the victim -- drives the hourlong episodes, while reporters who covered the case explain how the events impacted society. Artfully crafted re-creations play out like period thrillers, staying true to fashions and styles, while spotlighting cultural taboos and social norms surrounding each case.

How well do you know your neighbors? What are their names? What do they do for a living? After watching "Nightmare Next Door," you may want to find out a little more about them. Each episode tells the story of a murder that happened in a seemingly tight-knit community. Viewers get to the heart of the case through interviews with investigators, prosecutors, family members and -- of course -- neighbors, in addition to forensic experiments. The stories reveal twists and turns, and when a suspect emerges, the final outcome can surprise everyone involved.

Veteran journalist Paula Zahn steps out of the studio and into the field to unravel criminal investigations, tracking the drama of each story by featuring the opinions of those closest to the case, including law enforcement officials, the families of the victims and the incarcerated, lawyers from both sides, and first-time TV interviews with convicted murderers.

Chilling scenarios unfold in this true-crime series, which tells actual stories of people who shared their lives with loved ones who became killers. Each hourlong episode puts viewers in the shoes of the loved one, who first notices that something is amiss, interprets the puzzling signs and clues, and eventually comes face-to-face with the horrible truth: that the person has a very dark side. Exclusive interviews and firsthand accounts of the critical moments leading up to the vicious acts showcase devastating, often undiscussed consequences on the people who have nurtured, loved and raised a murderer.

Dark dreams see the light of day in "Your Worst Nightmare," a typical Investigation Discovery true-crime series complete with jump-out-of-your-seat moments and chilling conclusions. Classic suspense film techniques highlight re-enactments of creepy, harrowing crimes, as victims' darkest dreams become unfathomable realities. Each hourlong episode features one story interlaced with commentary from law enforcement, criminal justice professionals, and psychologists, plus accounts from friends and family of the victim.