S1 "Will We Ever Find Krystal Reisinger?"
Seeking personal enlightenment, 29-year-old mother Krystal Reisinger joins a drum circle in Crestone, Colo., July 13, 2016, but as night turns into day, she disappears.
S1 "Where Is Savannah Spurlock?"
Savannah Spurlock, 22, calls her mother at 2:30 a.m. Jan. 4, 2019, to say she was leaving a bar and would be home soon, but she was never seen again.
S1 "Have You Seen Elaine Park?"
Elaine Park, 20, is last seen in surveillance footage leaving her boyfriend's apartment at 6 a.m. Jan. 28, 2017, after going to a movie and sleeping over.
S1 "What Happened to Desirea Ferris?"
On May 1, 2017, Desirea Ferris, 18, spends the day hanging out with her sister and plans to celebrate her mother's birthday that evening, but she never makes it home and hasn't been heard from since.
S1 "Has Brian Shaffer Disappeared?"
After Ohio State University medical student Brian Shaffer, 27, fails to show up for a flight to Miami, surveillance footage shows him leaving a bar the night before never to be seen again.
S1 "Where Is Matthew Weaver?"
On Aug. 10, 2018, Matthew Weaver Jr. drops a friend off at her home, heads for a drive through the Malibu canyons, sends a mysterious text message to her the next day and is never heard from again.
S1 "What Happened to Devin Bond?"
Devin Bond, 16, wakes up early the morning of March 31, 2017, walks out of his home in Murfreesboro, Tenn., and disappears.
S1 "Will Tara Calico Ever Be Found?"
Tara Calico leaves home for her almost daily morning bike ride Sept. 20, 1988, and is never seen again.
S1 "Is Jesse Ross Still Out There?"
Jesse Ross, 19, calls his parents to say he was having a great time at a Model United Nations conference in Chicago, then they never hear from him or see him again.