Brandy Hall, a 32-year-old Florida mother and career firefighter, vanishes after leaving her fire station; Hall's truck is found submerged in a pond; now a new investigator uncovers evidence that could point to her killer.

Accomplished distance runner Amy Wroe Bechtel disappears in the Wyoming mountains, drawing the largest search in state history; evidence points to multiple possible suspects; a new tip might unearth her remains.

Just after dawn, twenty-nine-year-old Liz Barazza is gunned down by a figure in disguise as she is setting up a garage sale on her front lawn. Her doorbell camera records the attack. Several suspects quickly emerge. Who killed Liz Barraza?

In one of the most famous cases in Portland history, second-grader Kyron Horman vanishes from his school. Months later, allegations of an attempted murder-for-hire plot lead investigators to unexpected suspects.

Twenty-six-year-old Army veteran Kevin McGrath vanishes from a Carnival cruise after a celebration with his family. Despite a thorough canvass of the ship and a 3,300-mile Coast Guard search, no trace of him is found.

In 2009, 30-year-old devout Mormon Steven Koecher takes mysterious road trips, driving great distances across the desert, eventually abandoning his car in a Nevada cul-de-sac. His last known moments were caught on surveillance cameras.

A Colorado teen who dreams of being a nurse vanishes in the night; police initially deem Lashaya a runaway, but surveillance videos reveal a secret meeting with an ex and two mysterious figures who vanish into the darkness.

Could Sabrina Aisenberg still be alive today? Five-month-old Sabrina vanished from her crib near Tampa, gaining national attention; the investigation quickly zeroed in on her parents; but could Sabrina have been kidnapped?