Years ago, the day before Ellie moved from Georgia to California, she and her best friend Nolan sat beneath an ancient oak tree where they wrote letters to each other and sealed them in a rusty old metal box. The plan was to return eleven years later and read them. But now, as that date arrives, much has changed. Ellie, bereft of the faith she grew up with, is a single mom living in a tired apartment trying to make ends meet, while Nolan is an NBA star who suffers from loneliness.