It seems right that the lovers in Niall Williams's As It Is in Heaven hail from Italy and Ireland, those sentimental favorites among nations. Williams won kudos and laurels, fans and fame for his first novel, Four Letters of Love, and his second finds him once again illuminating a simple love affair with his own special brand of fine and even brave mawkishness. Dubliner Stephen Griffin, though possessed of a "thin and long" body, is stunted emotionally by the loss of his mother and sister in a tragic car wreck. That is, until one evening he ends up at a tiny concert hall in County Clare, listening to the Venetian beauty Gabriella Castoldi play the violin. Williams writes with fairy-tale breathlessness of the audience: "The room was balmy with delight. And when the people sat again for the slow and romantic melancholy of the Puccini, they were pillowed on a deep and heartfelt gladness.... Stephen looked at the woman whose name he did not yet know and his heart raced." Such mauvish passages abound. Here is an author who never met a bold pronouncement on the subject of Love that he didn't, well, Love. At one point, for instance, Stephen "heard the victory of Love over Death." What makes Williams's writing work--to the degree that it does work--is the way his fuzzy, myopic generalizations are coupled with keen observation: "Stephen danced like a man who had been given wooden legs. They flew out in sharp angles and measured air like a pair of pincers." A sta