It's common for killers to grab the front pages, with crimes so appalling that they exert a strange fascination on many people. But until this study, it has been rare to hear about what these people are like behind the headlines. Criminologist Christopher Berry-Dee goes behind bars to bring readers the last word from some of the worst criminals in the world. They speak of their violence and shocking deeds from within some of the hardest prisons on earth. These are the killers' stories, in their own words, providing an intimate look inside the people most readers encounter only in nightmares.