The internationally bestselling diva of dystopias is back with a new installment of "Positron," her darkly comic Byliner Serial about life in a Big Brother America of the near future. In the seemingly well-adjusted world of Consilience, it's dawning on the residents that they've thrown away the keys to more than their ragged former lives outside the high walls of their gated community. When they volunteered for this new social experiment, they also gave away the keys to their destinies, even their hearts. Ask Charmaine and she'll tell you her husband is a dead man. Sure, marriage can be murder, but when Charmaine plunged a deadly hypodermic needle into Stan, because it was part of her job—dispatching undesirables in Positron Prison—Stan survived. His former jailer, a libidinous security chief named Jocelyn, had switched out the death drugs for knockout drugs and drafted him into a plot to undo the increasingly sinister social scheme. In so doing, she promoted him from her sexual plaything to full-blown subversive. The underground is housed in a manufacturing plant of one of Consilience's most successful products: sexbots, made to order. Love, however, is not made to order, and despite a Darwinian labyrinth of betrayal after betrayal, including wild extramarital encounters and, yes, murder, Stan can't stop thinking about Charmaine. Not only because someone has requested a sexbot replica of her but because, well, she's home in a world without homes. In "The Heart Goes Last," one of Atwood's darkest and most deviously entertaining inventions yet, the human heart proves more resilient and true than any mail-order machine.