The report tells the story of the Prison Reading Groups (PRG) project from its beginnings in 1999 to the present. It makes the case for the importance of reading groups as informal learning in prison, and provides extensive evidence of the benefits of the groups: from prison governors, policy makers, librarians, volunteers. Above all, it emphasises the powerful voices of prisoner members themselves on what reading groups can do behind bars. The report was carried out by the University of Roehampton.