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

A young couple sets out from a holiday visit but never make it home as law enforcement search dangerous terrain fraught with derelict silver mines. In the black night and bitter cold, what happens when no one can hear you scream?

When a Michigan mother disappears on an afternoon walk, investigators pin all hope on their sole eyewitness: a 10-year-old boy who may have witnessed the unthinkable.

A beloved mother is found brutally murdered near the military town of North Pole, Alaska, and soon four more girls meet the same fate.

Federal agents descend on a tiny Ohio town after a beloved girl goes missing.

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 spunky grandmother and former bail bondswoman is a no-show at work, leaving friends and family desperate for answers.

When a California mother wakes to find the door wide open and her daughter missing, law enforcement travel the country to find her until they discover a dark plot that began at the teen's doorstep.

Detectives attempt to trace a young woman's last steps as she leaves a casino and disappears into the night. An almost forgotten childhood memory helps find her buried in the backyard.

A retiree settles in Southern California hoping to live his best life; when he disappears without a trace, investigators must uncover if his demise was connected to the unconventional pen pals he made.

Detectives from Ohio uncover the mystery behind the unearthed body parts of two missing teenagers.

A Milwaukee contractor is shocked when he discovers a body in a shallow backyard grave.

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 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 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.

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.

When a promising forensics student is found mutilated on a lonely stretch of Utah motorway, her Sheriff's department colleagues will stop at nothing to deliver justice.

When a Texas father disappears without a trace, investigators go on an international manhunt to catch a killer and unravel a sinister plot that has them searching for answers deep into the Chihuahuan Desert.

A champion Russian boxer disappears from Brighton Beach, N.Y., and the neighbourhood dare not talk for fear of reprisal until investigators uncover a long-buried secret in a New Jersey backyard.

A construction worker unearths human remains in the backyard of an old farmhouse.

A southern California community is gripped by fear when one of its own vanishes without a trace.

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 man makes a disturbing discovery in a backyard beach, a series of horrifying events unfold.

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