Mariella Frostrup talks to Patrick Flanery about his new novel I Am No One, a disturbing tale of transatlantic surveillance, as a university professor comes to realise he is being watched. And she discusses the joys of writing about the 1976 heatwave with two writers, Joanna Cannon and Isabel Ashdown, who are bringing some summer sun to these winter months. Acclaimed novelist Han Kang sends a literary postcard from South Korea and Mariella explores the literary past of one of this year's Oscar contenders, The Martian.

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