"The Guantanamo Diary" is a memoir written by Mohamedou Ould Slahi, a Mauritanian man who was detained at Guantanamo Bay for 14 years without formal charges. The book details his experiences of imprisonment, torture, and the psychological impact of being held in a controversial military detention facility. The diary, written during his time in captivity, provides a personal perspective on the broader issues of human rights, war on terror, and the legal challenges surrounding indefinite detention. Slahi's narrative highlights the struggles faced by detainees and raises questions about justice and accountability in the context of national security.