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The Canadian author Margaret Atwood has always been able to take us into other worlds in her fiction, but none as disturbing as The Handmaid's Tale which came out in 1985.

It has variously been made into a film, a graphic novel, an opera, and a hugely successful TV series, but as we await the fourth season, Atwood revisited Gilead, with a sequel, The Testaments, as the repressive regime, fifteen years on starts to rot from within.

Here, she speaks to presenter Kirsty Wark.