In the suburbs of Atlanta, Ga., a pregnant woman and her fiancé are kidnapped on the night before their baby shower and the fiancé's family receives ransom calls that same night.

In Rison, Ark., a young woman is abducted from her home in the middle of the night; when investigators dig up her body in the woods, they uncover an appalling murder plot that led to the victim's gruesome demise.

When a young woman disappears after a visit to the mall, and investigators discover from store surveillance footage that she has been abducted, she is found dead in the woods.

In Dayton, Ohio, a young mother goes missing after attending a party, and her identical twin becomes convinced there is something deeply sinister afoot.

In North Port, Fla., police receive a call reporting that a young mother has gone missing; in an effort to find her, detectives follow a trail of incoming 911 calls that reveal a heartbreaking story more horrific than they could have ever imagined.

Billy Carter raises daughters Crystal and Misty in the Great Smoky Mountains of North Carolina; after a body is found on the scenic Blue Ridge Parkway, this family's piece of paradise becomes a nightmare they relive again and again.

On the Northern Cheyenne Indian Reservation, a young mother goes missing after the Fourth of July; when her body is discovered in the woods, the victim's family dig through the memories of their loved one to provide investigators with critical clues.

A tip from a missing persons network helps identify the body of a John Doe murder victim, leading investigators to unravel a dark tale of betrayal.

In the coastal town of Leland, N.C., a missing woman is found dead in a swamp; as detectives speak with the victim's friends and family, they begin to unravel the truth behind a horrifying murder.

In Ohio, a woman is found stabbed to death in her kitchen after she fails to show up for work; her sister is able to help detectives solve the case after a family heirloom is discovered during the investigation.

Sharon Ord and her family leave Scranton, Pa., to start a new life in Florida; then one of them disappears, turning their dream of a new life into a nightmare.

In Stamping Ground, Ky., a young woman's dead body is found late at night by her brother and father; when detectives learn the victim was pregnant, they consider it a motive for murder and begin a homicide investigation.

Hundreds of homicide cases in any given year can shake even the staunchest cities and police departments to the core. The statistics, however, don't paint the real stories and the effect that lingers -- through the pain endured by victims' loved ones, the community impact, and the memories that detectives will never forget. "Homicide City" explores unforgettable murder cases from major American cities, investigations that had law enforcement banding together across metropolitan landscapes in a sequence of manhunts. Each story is told by veteran homicide detectives, local reporters, and the victims' families.

From the moment a homicide is reported, a file is assembled to document every facet of the investigation -- crime scene photos, notes and observations, forensic reports, witness interviews, suspect profiles -- and continues to grow with new information until an arrest is made and conviction attained. Investigation Discovery opens these "murder books" to tell haunting tales buried within the pages. Hourlong episodes take viewers back in time with details of decades-old cold cases using actual archival footage, crime-scene evidence and first-person interviews with lead investigators, unraveling the mystery and uncovering what broke the cases open.

Inspired by HBO's acclaimed drama "True Detective," Investigation Discovery brings to life actual homicide cases through the words of the law enforcement officers who are still haunted by them. "Real Detective" blends documentary and scripted elements -- and narratives driven exclusively by the detectives themselves -- to create cinematic true crime TV, with featured guest stars including Michael Madsen, Devon Sawa, Curtis Caravaggio and Zoie Palmer. Each hourlong episode ventures deep into the mind of a homicide detective as he or she describes in vivid detail the one case forever ingrained in the memory.

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.

"Who Killed Jane Doe?" presents a unique journey of discovery, loss, mystery and resolution. Featuring Investigation Discovery's distinctive stylized re-enactments, each hourlong episode weaves together two parallel stories: that of detectives who gather clues to identify a victim and the manner of death, and that of a family who knows very well who the victim is and is struggling to find her. The emotional tales honor the nameless and offer a final resting place to a missing loved one.

"Murder by Numbers" begins in a similar fashion to many true-crime series. After a body is found, an intense investigation commences, quickly turning the focus to a very likely subject. But just as the viewer eases into the case via cinematic re-enactments and through the eyes of detectives, a shocking discovery of a second body not only eliminates the original suspect, it redirects the investigation on a harrowing journey of pure criminal evil.

"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.

"48 Hours" began as a documentary in 1986 and became a regular series two years later. It was built around a team of correspondents covering one subject for 48 consecutive hours. Over time it evolved into the premiere broadcast for law, crime and justice stores -- its journalists, for example, have been credited with uncovering new information that has led to high-profile cases being overturned and wrongfully convicted people released from prison. The large library of episodes are revisited in "48 Hours on ID," focusing on investigations that explore themes of jealousy, murder and deceit.

Like a pane of glass cracking in all directions before shattering, the impact of a single crime can create ripple effects that forever alter multiple lives. This Investigation Discovery series unravels actual homicide cases to explore how the past continues to haunt the present for those involved -- loved ones, witnesses, and law enforcement. Each episode is structured around three distinct perspectives of the same crime, and as viewers learn different details by way of first-person interviews and stylized re-enactments, stories, which at first seem random, slowly start to intertwine.