In 1974, a 5-year-old girl disappears while walking to her friend's house; after 46 years, detectives are able to put the case to rest using modern DNA technology.

When a woman takes a genealogy test to learn what happened to her estranged mother, she is shocked to learn that her DNA has helped law enforcement identify two bodies found in California's Mojave Desert in 1980, which remained a mystery for over 40 years.