Agatha Christie centenary celebration - Sarah Phelps and James Prichard

In this brand-new episode of A Stab In The Dark, award-winning crime writer Mark Billingham celebrates the centenary of the release of Agatha Christie's first published novel - The Mysterious Affair At Styles - by talking to acclaimed screenwriter Sarah Phelps, who has adapted five Christie novels for television. Mark and Sarah discuss the celebrated novelist's life and work, and cast a critical eye over her motivations and themes. Elsewhere, our man with the spyglass, Paul Hirons, talks to Agatha's great-grandson, James Prichard, about the centenary and what it means to the Christie family.

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