A short book written by an ex prisoner explaining how to get through your sentence as best you can. He tackles subjects like food, visits, sharing a cell and what happens when you get released. Some of it is done in a light hearted way, but he does also address some serious stuff too like emotional issues and how to deal with being away from your family. It is written from the point of view of being a prisoner in the UK but I think much of his advice is transferable to any country.