I watched a few years ago a French movie about a Parisian family owning a quasi-slave, a young woman from (IIRC) Africa. The son of the family finally sent an anonymous mail to an organization which had it taken care of. The interesting character was the grandmother who was vehemently supporting her son (the father of the boy who sent an email) until she realized how the slave-girl was treated.

The movie was average but I am mentioning it here because contemporary slavery (or almost slavery) can happen next door, today. Even a an average movie (we call these in French "TV movies) can be eye opening.