In her twenties, Belle da Costa Greene is hired by J. P. Morgan to curate a collection for his newly built Pierpont Morgan Library. Belle becomes a fixture on the New York society scene and one of the most powerful people in the art and book world as she helps build a world-class collection. But Belle has a secret, one she must protect at all costs. She is the daughter of Richard Greener, the first Black graduate of Harvard and a well-known advocate for equality. Belle's complexion isn't dark because of her alleged Portuguese heritage that lets her pass as white - her complexion is dark because she is African American.