A friendly bet exposes a terrifying scene under a California home.

Bonnie Gamboa and her newborn inexplicably vanish from their California home. When blood is discovered in their backyard, a grieving father's world is flipped upside down and scrutinized. Investigators race against the clock to bring this mother and child home before it's too late, but in an astonishing twist, an unexpected suspect and a motive built around deception and lies leave investigators and family members stunned.

A pleasant Michigan day takes a dark turn when a field hand digs up a human skull in a sprawling backyard; the discovery leaves a tight-knit community shaken to its core and questioning whether a killer has penetrated the safety of its town.

A hike in the woods of the Hollywood Hills takes a terrifying turn when a dog digs up a female foot. As panic spreads through a Southern California community a family fears for its own safety and investigators will stop at nothing to catch a killer.

A lovesick teen goes missing, and investigators in Indiana learn she's keeping a secret; teens make a gruesome discovery in the woods, and a local high school's dark secrets are soon revealed.

A party in the woods of a Pennsylvania coal-mining town takes a turn when someone goes missing.

A beloved high school track star vanishes into the Philadelphia night and those in her innermost circle are eyed as suspects. When a terrifying scene is unearthed in the nearby woods, a family demands answers, but nobody is prepared for the truth.

When a new college graduate's car is found abandoned, investigators race to find the missing girl.

A couple makes a ghastly discovery buried in their Ohio home. And when investigators field another call, they fear someone may be preying on young women. But as suspects begin to surface, a cover-up far more sinister than the crime comes to light.

The joy of Christmas looks bright for a doting Oklahoma Mom. But her kids wake up to a living nightmare when she's inexplicably gone. As investigators track two suspects down a deceitful road, an incendiary break lures the killer out of the dark.

After a real estate agent disappears, Florida investigators scrutinize the men in her life.

A horrific discovery in a backyard cornfield is just the beginning of an unspeakable scene. As horrors unfold in this small, Midwest town, someone is playing a deadly game of cat and mouse and it will be years before a ghastly truth is revealed.

When the car of a Southern California girl is found abandoned, investigators spend years and travel hundreds of miles trying to solve her mysterious disappearance. Finally, an unimaginable backyard discovery by drug agents leads to a vicious killer.

A land developer disappears into the Arizona desert, and a brother sets out to uncover the truth; when hikers stumble onto a gruesome discovery, investigators quickly realize no one can be trusted when they find themselves in the line of fire.

When a concerned neighbor stumbles onto a horrifying scene in a Spokane, Washington home, a family is devastated and some buried secrets come to light. Investigators unravel a bizarre web of truths and lies to find enough evidence to catch a killer.

A Florida co-ed disappears after a night on the town. As investigators trace her last steps, they fear some missing girls at another campus might be connected. But when a dog sniffs out a backyard grave, the key to this mystery is far closer to home.

When a private investigator disappears with tens of thousands of dollars, Florida detectives question whether she's alive and well. But when a buried body is uncovered, they chase a trail of secrets and lies to catch a killer just out of reach.

A former Catholic priest turned realtor vanishes from Florida and investigators find themselves examining circumstances stranger than their suspects. When a tip exposes a murder-for-hire scheme, the mastermind is revealed as a cold-blooded killer.