This week, hundreds of fans gathered in London to celebrate the launch of The Testaments, the much-anticipated sequel to Margaret Atwood's best-selling novel, The Handmaid's Tale. Similar events took place around the world, and the novel has already been shortlisted for the Man Booker Prize. Today on Front Burner, Slate's book critic Laura Miller on the political and cultural relevance of The Handmaid's Tale, and why there's been so much anticipation for its sequel.