Season 4

After 15-year-old Kristen Galvan disappears, Houston police pick her up and say she may have been trafficked. She's recovering when she vanishes again.

In search of her daughter Kristen, Robyn sets out on a journey into Houston's underworld, encountering pimps, johns, and con artists along the way.

When Dane Elkins goes missing, it looks like he's gone off the grid. A 911 call points to a car crash. Or is his disappearance linked to mental distress?

Echo Lloyd moves to a remote part of the Ozarks to be alone. When she vanishes, suspicion falls on her odd neighbor - and on her own daughter.

When 14-year-old Justin Rutter doesn't come home one night, his family panics. Police think he's a runaway, but evidence suggests something more sinister.

Irene Gakwa comes to America from Kenya to join her brothers and become a nurse. When she disappears, her American dream becomes her family's nightmare.

19-year old Dylan Rounds goes missing without a trace from his farm in remote northwest Utah. Then Dylan's gun reappears mysteriously in his camper.

With no sign of Dylan, wild theories abound. Then attention begins to focus on the strange old man squatting in a shed a few miles from Dylan's farm.

27-year-old Pepita Redhair is last seen by her mother after she drops her off at Pepita's boyfriend's house. Did she just run away, or is she the victim of something much more sinister?

Transgender indigenous woman Aubrey Dameron vanishes in the middle of the night. Shocking theories emerge as her aunt and uncle search for answers.