In the summer of 2021, Gabby and her fiancé Brian take a "van life" trip to the American West. But a 911 call raises alarms about their relationship.

Days after a police stop in Utah, Gabby goes missing and her parents alert the authorities, setting off a massive search for her — and for Brian.

Gabby's loved ones grapple with the shocking news of her death. As the police close in on Brian's location in Florida, suspicions about his parents grow.