Since 2002, Mohamedou Ould Slahi has been imprisoned at the detainee camp at Guantanamo Bay, Cuba. In all these years, the United States has never charged him with a crime. Although he was ordered to be released by a federal judge, the US government fought that decision, and there is no sign that the United States plans to let him go. Three years into his captivity Slahi began a diary, recounting his life before he disappeared into US custody and daily life as a detainee. His diary is not merely a vivid record of a miscarriage of justice, but a deeply personal memoir - terrifying, darkly humorous, and surprisingly gracious. It is published now for the first time, Guantanamo Diary is a document of immense historical importance.