Red, White & Royal Blue is a romantic comedy film based on the New York Times best-selling novel by Casey McQuiston. The film follows the President of the United States son, Alex, and Britain's Prince Henry, who are at odds over nearly everything. However, the two get into an altercation at a significant event, further causing a divide between the two nations; they are forced to reconcile their differences on paper. But as the two spend time together, their rivalry evolves into something more.