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After young father Matthew Podolak dies from antifreeze poisoning, the manner of his death remains undetermined until his brother embarks on a quest for the truth.

After young father Matthew Podolak dies from antifreeze poisoning, the manner of his death remains undetermined until his brother embarks on a quest for the truth.

Josh Mankiewicz reports on the mysterious disappearance of a Colorado rancher, whose friends think something isn't right and spend years fighting for answers.

A former judge retires to Florida and becomes the center of a mystery when he vanishes; police must unravel the possible connection between his disappearance and a ghastly discovery found buried at an abandoned golf course.

A weekend getaway at a Reno resort becomes the center of a mystery when a respected college professor disappears; police learn that the answers may lie buried beneath desert sands hundreds of miles away.

When a popular librarian vanishes after a night of dancing in Kentucky's capital city, the investigation focuses on family secrets, but police must unravel a different kind of secret to get to the truth buried in one of the city's parks.

Police believe the discovery of a body in a Florida backyard ends the desperate search for a missing woman, but it only deepens the mystery.

A beloved Missouri couple is thought to be swept away in a record-breaking deadly storm, but when a closer look at the family farm points to foul play, law enforcement searches for clues long since washed away.

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.

After a woman falls to her death while hiking with her husband in Rocky Mountain National Park, rangers question if her death was an accident.

It's Friday the 13th and something sinister is about to happen: a chilling double murder in an upscale home; the evidence seems to tell a clear story until investigators discover a marriage filled with secrets and a story that doesn't add up.

A quiet night is shattered when intruders terrorize a Florida couple and their young son, killing one of them; investigators question the initial story; a tip leads them to another family with dark secrets, and that's when bonds are tested.

Annie Kasprzak has a second chance at a happy life after being adopted by her case worker; then, the 15-year-old vanishes; her parents find a note in her room that reveals a secret Annie has been hiding.

Fire chief Keith Bryan is shot dead in his home, leaving police to wonder who would want to slay the local hero.

A quiet North Dakota college town is left in fear after student Mindy Morgenstern is found murdered in her off-campus apartment.

The investigation into the mysterious disappearance of a Canadian man sparks an international manhunt for an elusive killer with multiple false identities.

Beauty queen Nona Dirksmeyer plans a future with the boyfriend she adores, then she is brutally killed; the crime shakes her hometown and exposes someone with a secret past.

The investigation into the mysterious disappearance of a Canadian man sparks an international manhunt for an elusive killer with multiple false identities.