This week, Professor Jonathan Bate on a tiny Elizabethan portrait with an illuminating history; and novelist Gwendoline Riley assesses the mysterious life and work of Dame Muriel Spark.
'Electric Spark: The enigma of Muriel Spark', by Frances Wilson
'The Letters of Muriel Spark – Volume 1: 1944–1963', edited by Dan Gunn
Produced by Charlotte Pardy
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