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A young police officer is ambushed and shot in the middle of the night on his way home from work, but it isn't the only unsolved mystery in the small community of Bardstown, Ky.

Real Life Nightmare

Ambush on Exit 34

Two-year-old Arianna vanishes from San Francisco after her young mother is discovered murdered and buried in a local park.

Mommy Murdered: Arianna Vanished

The remains of a 10-year-old girl are discovered more than 100 miles away and eight years after she disappeared while walking home alone in a small town in Washington.

Who Kidnapped Lindsey?

A Catholic priest investigating sex abuse within the church is found with his throat slit in his church of 32 years.

Secrets in the Catholic Church: Father Kunz Murder

In March of 2014, 239 passengers vanish, never to be seen again; shortly after takeoff, a routine flight becomes a trip from hell when pilots stop responding and the plane disappears from radar.

The Disappearance of Flight MH370

Twenty-four-year-old Meredith Emerson disappears New Year's Day on a hike up Blood Mountain; eyewitness accounts of a strange, toothless man with a dog lead investigators to Meredith's remains, and uncover several unsolved murders.

Blood Mountain: The Hunting Ground

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Heart-wrenching, personal stories of unsolved missing cases and unexplained deaths that continue to baffle investigators and horrify those left behind.

S4 E3 | Secrets in the Catholic Church: Father Kunz Murder