Joanna Drayton, a young woman, returns home to San Francisco with her fiancé, John Prentice. The catch? John is African American, and Joanna's liberal parents, Christina and Matt Drayton, must confront their own biases when faced with the societal expectations and prejudices of the 1960s. As the couple announces their intention to marry, the Draytons grapple with their own beliefs and challenge the racial norms of the time.