Harper Lee's Go Set A Watchman, Dickens discovery, Jenny Holzer

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John Wilson discusses Harper Lee's novel Go Set a Watchman, published for the first time today, with Bonnie Greer and Erica Wagner. How does it compare to To Kill a Mockingbird? The discovery of Dickens' own copies of a periodical he edited reveal hundreds of previously anonymous short stories and poems to be by famous Victorian writers, including Wilkie Collins and Elizabeth Gaskell. With Antiquarian book dealer Jeremy Parrott. Photographer Eamonn McCabe reviews a new film about the Brazilian photographer Sebastião Salgado, The Salt of the Earth, directed by Wim Wenders. And artist Jenny Holzer, famous for LED signs, light projections and slogans talks about her career, as a major retrospective opens in Somerset.