Mariella Frostrup talks to Jon McGregor about his new novel Reservoir 13, a haunting exploration of the impact of a missing child on a Derbyshire community. Polly Clark explains why she decided to fictionalize a less well known period in W H Auden's life when, as a young man, he worked as a school master in Scotland. Mariella is also joined by another devotee of Auden, writer Alexander McCall Smith, to discuss the poet's timeless appeal. We discusses the novel behind the film 'What's Eating Gilbert Grape?' which is being re-released. And Wendy Holden tells us about the Book She'd Never Lend.