What Knight (Christopher Walken) is most proud of is undoubtedly his unique ability to save money. "Five dollars a day" is his motto that he often says. What Knight regrets most is that the relationship between him and his son Flynn (Alessandro Nivola) can't be described in other words except "dropping below freezing point". An unexpected illness made Knight think of reconciling with Flynn. Coincidentally, Flynn was also experiencing his lowest point in life at this moment. In this way, the two depressed men drove a broken car and embarked on the road to seek medical treatment. Along the way, Knight fully implemented his life principle-saving as much as possible, which made Flynn feel unbearable, and between a series of conflicts and misunderstandings, the relationship between father and son gradually warmed up.