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Stephen Sackur speaks to a woman who has made her living out of crime - often violent disturbing crime. Val McDermid is one of Britain's most popular novelists. Her stories of twisted killers and flawed detectives are part of a modern genre of graphic crime fiction that's far removed from the conventions of Agatha Christie and Arthur Conan Doyle. Compelling stories peppered with horrifying violence entertain millions around the world, but are they potentially corrosive too?