A new feature film, “The Mauritanian,” tells the story of Mohamedou Ould Slahi, a Mauritanian man who was held without charge for 14 years at the U.S. military prison at Guantánamo and repeatedly tortured. We speak with Mohamedou Ould Slahi, who says the film is not just about his struggle. “This is not my movie. This is the movie of so many people,” he says. “Some of the people who were kidnapped after 9/11 were tortured to death. They did not have a chance to tell their story.” We also speak with Kevin Macdonald, director of “The Mauritanian”; Nancy Hollander, the lead lawyer for Mohamedou Ould Slahi; and actor Tahar Rahim, whose portrayal of Slahi earned him a Golden Globe nomination.