Ashley Davison, a graduate student in California, desperately wants to spend the holidays with her family in Seattle. Dashiell Sutherland, a former army intelligence officer, has a job interview in Seattle and must arrive by December 23. Though frantic to book a last-minute flight out of San Francisco, both are out of luck: Every flight is full, and there's only one rental car available. Ashley and Dash reluctantly decide to share the car, but neither...