In an excellent documentary called Stolen, which sets out to document a family reunion in the sole region in Africa where Spanish is spoken, filmmakers Ayala and Fallshaw uncover a bigger story than they had originally planned. What they find is a pocket of slavery still practiced in Western Sahara, Morocco, Mauritania, and elsewhere in Arab-African societies. The initial impetus for the film is the re-union of a generational family under UN auspices, a service the UN provides if the correct paperwork is filled out; family members long separated are brought together for a joyous 5-day reunion. What the documentarians...