On a warm summer day in 1976, 26 children went missing from the town of Chowchilla, California, setting off one of the most bizarre kidnapping cases in U.S. history.

When a 15-year-old girl vanishes on her way home from a friend’s quinceañera rehearsal in 1998, a California community holds its breath and hopes it’s a one-off. But when other young women in the community are targeted one by one, investigators have to ask if there’s a serial killer in their midst.