Gugu Mbatha Raw gives a lovely, warm and spirited performance as Dido Elizabeth Belle, who is the offspring of a British naval officer and a black Caribbean slave. When Belle’s mother dies, her father, before going off to sea and the fate that awaits him, arranges for her to be brought up in his family surroundings with aristocratic rights. The admiral’s uncle, Lord Mansfield, a top level jurist played with the skill we have come to expect from Tom Wilkinson, shudders at the idea of a slave child in the midst, but faithful to his duty and basically a very decent human being, he takes the girl under his wing, abetted by his wife (Emily Watson) and sees to it that Belle is raised properly.

Of course, this causes tension with relatives and acquaintances, and despite the loving care she receives, Belle is not allowed to dine together when guests are invited to dinner. And how can a marriage be arranged for such a young lady even though she has a substantial inheritance?

Belle bonds with her cousin Elizabeth, nicely played by Sarah Gordon, but the situation leads to tension in the quest for a good marriage. Belle generously offers to share some of her inheritance and the bond between the young women continues. Ultimately, Belle meets John Davinier (Sam Reid), an idealistic young man who is aided by Lord Mansfield in his pursuit of a law career, but they battle as a result of their respective viewpoints. Belle and her amour meet a crisis when a current issue of slavery involving a terrible event at sea hits the courts in an effort to fix responsibility.

The famous actual Zong case comes up before Lord Mansfield, and the question posed is whether he will rule according to his conservative background or hold the shipping company responsible for the deaths of slaves being transported but dumped into the sea to get rid of them when there is widespread illness. An insurance claim has been made for the dead human cargo, and the pressure on the judge is great not to rule against the shipping company. In the film Belle and John play a role in making sure that important evidence surfaces.