Frances Scott, the penniless niece of an English lord, agrees to marry Bristol trader Josiah Cole, an arrangement that provides her with a home and him with the social contacts he needs to build his business. However, she is forced to confront her need for love and liberty when Josiah brings the slave Mehuru to their house and assigns her the task of training the man, a former priest and aide to the King of Yoruba, to become a house servant.