Backcountry ranger Randy Morgenson was the go to person if someone was lost or missing in Sequoia Kings Canyon National Park, until the day he vanishes. Colleagues search for him in dangerous terrain uncovering unsettling secrets. What happened to Randy?

31 year-old Mike Williams went duck hunting on a Florida lake and disappeared.  Some said alligators ate him, but his mother isn't buying it. She convinces police to investigate, and when they dig deeper, they turn up suspicious evidence of foul play.

On August 20, 2010, 30-year-old Ben McDaniel attempted one of the most dangerous underwater cave dives in the United States--a cave called "The Vortex" in Ponce De Leon, Florida. Underwater witnesses saw him entering the cave, though when he never resurfaced, authorities believed his body would be recovered in the cave. But the most experienced cave divers in the world went down there looking for him and found nothing. So what happened? Did Ben fake his own death? Where is he?

Twenty-four year old competitive runner Amy Wroe Bechtel goes for a run in the forest outside of Lander, Wyoming and vanishes without a trace. WAS IT BIGFOOT? WAS IT HER HUSBAND? The investigation into her disappearance spans years and hundreds of square miles.

Twenty-four year old aspiring actress, Satara Stratton disappears in Hollywood. In Tennessee, her mother Sharon is desperate to find her and launches a search to find Satara that takes her deep into the seedy side of a star studded city.

Thirty-two-year-old Hatice Corbacioglu thought she'd met the man of her dreams. But when she traveled overseas with him to meet his family and didn't contact her own family for weeks, everyone knew something had gone terribly wrong. And when the fiance returns to the States without her, the frantic search for Hatice begins.

52-year-old Colleen Wood has found love and a new life in South Florida. Her wealthy boyfriend offers her the chance of a lifetime--- a round the world trip on his yacht. Then Colleen suddenly vanishes and the boyfriend is the only one who knows why.

When Terrance Williams goes missing, his family fears that he may have been arrested for driving without a license. But when they find that his car has been towed by a police officer, with no record Terrance having been arrested, an investigation reveals the disturbing truth.

35 year-old Jesse Capen vanishes on a camping trip in Arizona's Superstition Mountains. While law enforcement searches the vast wilderness, his family finds a huge secret on his computer. His disappearance may have to do with the legend he is chasing.

21-year-old Bethany Decker is a hard-working student, waitress, mother, and wife of a National Guardsman serving in Afghanistan. When she vanishes while pregnant with her second child, police discover her life was more complicated than anyone realized.