Surveillance footage reveals a mysterious figure tracking 18-year-old Kelsey Smith's movements when she goes shopping for a present for her boyfriend but never returns home.
Julia Jacobson disappears driving across California on a Labor Day road trip with her beloved pet dog. Police follow her digital footprints to uncover the truth about her final moments, 100 miles off course from her planned destination.
Investigators discover that moments after teenage social media star Alexis Murphy posts her final tweet before vanishing, she is captured on surveillance footage at a local gas station.
Michael Sandy, an interior designer who recently moved to New York to find a husband, becomes the victim of a hit-and-run accident on a busy highway. Police discover clues that suggest he was targeted for attack.
When soon-to-be college freshman Heather Maples is discovered murdered in her own bed, investigators discover a remarkable clue preserved at the scene.
After a night out in New York City with his new girlfriend, 56-year-old businessman Charles Butler simply vanishes, and his panicked children only receive confounding texts in response to their inquiries.
YingYing Zhang, student University of Illinois, misses a campus bus by seconds and then vanishes. As police trace the final moments before she disappeared, they discover a dark secret on campus that takes the case in a shocking direction.
Laura Johnson, a mother of five, moves in with her boyfriend in Billings, Mont., then suddenly stops communicating with her family. Her son rushes halfway across the country to learn why and finds disturbing clues that explain how she vanished.
While 24-year-old Willard Grandstaff toils away at his convenience store job, he dreams of what the future holds; on Sept. 27, 2004, his standard overnight shift becomes his last.
After asking to drop off a book off at a friend's house, 15-year-old Danielle Locklear never returns home, but a cryptic clue leads investigators to a secluded creek.