The story of how Richard Williams served as a coach to his daughters Venus and Serena, who will soon become two of the most legendary tennis players in history.

Moon River takes place in Glendale, California and follows the story of Richard Waters and his film crew. On the night of their first day of filming, Richard and his team throw a party where their production assistant, Peter, is murdered. After another murder, the people of Glendale, as well as the police, conclude Richard must be the one behind the murders. It's up to Richard to solve the case before he finds himself killed or in prison.