UPDATE: a recent BBC article describes the contents of a report by the International Committee of the Red Cross, which was leaked- the report describes the torture of 14 'high value' detainees, based on interviews the ICRC conducted after the detainees arrived at Guantanamo.
Our March author, Mahvish Rukhsana Khan, was a law student when she heard about the Guantanamo detainees. She is also a Pashto speaker, and she ended up working with some of the lawyers representing the detainees as a translator. The book is her account of her experience.
Human Rights Watch has done a lot of work on Guantanamo- please take a look at their Guantanamo Webpage.
Please read the NYT book review to read a complete introduction. The book also has a facebook group, which you can join if you are interested.
Please also watch this video from Current if you would like to see some footage of Guantanamo, and listen to a discussion of the closing of the camp.