If you haven't seen this and fancy something thought provoking it's definitely worth a watch. It's a true story about a woman who wrote the book "Caste" about how the slave trade and the holocaust and Indias untouchables are all linked by societies need to be superior to a particular minority ( I'm sure I am paraphrasing dreadfully).
Its a little preachy and about half an hour too long ( like most films) but it is thought provoking particularly if you are interested in history.
It's also good to see a film where the lead female character actually looks like a real person.