Jamaica Kincaid’s beautiful, painful new book, her first novel in a decade, chronicles the dissolution of a marriage. Mr. Sweet is a composer of difficult works of modern music. He resents Mrs. Sweet, his Caribbean-born wife, for taking him from his beloved Manhattan and making him move to Vermont with their children, the daughter he adores and the son he detests. Kincaid uses Virginia Woolf-style repetition to create a hypnotic portrait of a dying love.