My guest in this week's Book Club podcast is the biographer Frances Wilson, whose new book Electric Spark: The Enigma of Muriel Spark was recently lauded in these pages as "mesmerising" and "a revolutionary book". She tells me how she immersed herself in the spooky life and peerless art of the great novelist, and why a conventional biographical treatment would never have been adequate to a subject for whom fiction and reality twined in unexpected and disconcerting ways.

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