Based on the New York Times best-selling memoir “Guantánamo Diary” by Mohamedou Ould Slahi, “The Mauritanian” tells the true story of a man who spent 14 years of his life imprisoned without charges at the notorious United States military detention facility. The film is a standard legal drama that focuses more on the man and his case rather than the atrocities that were levied against him. It still reinforces what most of us already know: Gitmo was a terrible, terrible place. Detained on the suspicion that he was connected to the 9/11 terrorist attacks, Slahi (Tahar Rahim) was held by the U....