Set in mid-eighteenth century Britain, Belle is a combination of Austen-like soap opera, inspiring (but fictionalized) biography, a little courtroom drama, and social commentary. It's not bad, but "just OK" not great either. It seems designed as Oscar-bait, but did not get any nominations.
The hero is "Dido", the beautiful but illegitimate mixed-race offspring of a British naval officer and a West Indies slave woman. The officer does the right thing, extracting the young Dido from slavery and ensconcing her with his British noble family. Then he's off again doing what British naval officers do, which unfortunately involves him dying.
Leaving Dido in a complex situation: her family has mixed feelings about mixed-race folk; British society of the day was not the most enlightened either. While Dido is charming, intelligent, and beautiful, her Austenesque prospects are not good. (There is a lot of back and forth about who's gonna marry who.)
Complicating things even further is her Uncle William, a judge, who must rule on the case of the Zong, a slave ship that threw its living cargo overboard in order to have enough drinking water for the more fortunate crew.
All in all: watchable, but also missable.