Movie Story : The Mauritanian follows Mohamedou Ould Slahi, a man held at the U.S. military's Guantanamo Bay detention center for more than a decade without ever being charged with a crime. Desperate for freedom, he turns to a determined defense attorney who agrees to take on his case. Based on a true story, the film is a tense drama about the fight for justice against a system that refuses to let him go.