Joan Bakewell explores areas of belief with artists, thinkers and other public figures. She talks to prize-winning novelist, critic and cultural historian Marina Warner who, although brought up Catholic and a former pupil of one of Britain's top convent schools, abandoned her faith in her twenties while writing her second book Alone of All Her Sex: The Myth and Cult of the Virgin Mary. Yet she remains personally and professionally interested in all things religious, magical, mythical and irrational.