Millie is trying to make ends meet to help provide care for her failing great-grandmother, Joy, who is suffering from dementia. Joy, in a moment of lucidity, references a diary, a treasure map, and a treasure at a nearby estate. In another scene, Ben is in need of more money to make amends for his mother. We don't know what she did or why he feels the needs to make amends. It sounds like his journey will intersect with Millie's as they both try and take care of people.