16-year-old Miranda has been abandoned by her mother, and has dropped out of school. She is supporting herself as an employee at McDonalds while her father, Charlie, resides in a mental institution.
When Charlie is released and sent back to their home, Miranda finds the relatively peaceful existence she’s built for herself completely disrupted. Charlie has become obsessed with the notion that the long-lost treasure of Spanish explorer Father Juan Florismarte Torres is buried somewhere near their suburban California house in the Santa Clarita Valley. Armed with a metal detector and a stack of treasure-hunting books, Charlie soon finds reason to believe that the gold resides underneath the local Costco, and encourages Miranda to get a job there so that they can plan a way to excavate after hours.
Initially skeptical, Miranda soon finds herself joining in Charlie’s questionable antics in an effort to give him one last shot at accomplishing his dreams.
After becoming involved with some swingers, Miranda then helps Charlie break into the Costco. Once inside the Costco they drill through the floor and then into an underground river. Charlie steals some scuba diving equipment, dives into the river, and then finds the gold. He retrieves much of it but tragically does not return from his last dive, where he pursues further and finds the missing explorer. Charlie left Miranda a tag and told her not to lose it. The next day, she visits Costco and finds the product the tag belongs to, a dishwasher. Miranda buys the dishwasher, takes it to the beach, and opens it. When Miranda opens the dishwasher she is seen bathed in a golden glow and a slow smile spreads across her face, a strong indication that Charlie has cached the gold inside the dishwasher, although the gold is never actually shown to the viewer.