One minus one doesn't even cancel itself out since this is really dealing with the deficit of divorce in terms of Emily Bean, thirty, who comes back alone to New Hampshire to teach. The givens here are pretty much the same as in Miss MacDougall's last book, The Cost of Living. And so is the tone -- the same feminine, bluesy retrospective since Emily can't seem to forget David -- David who's settled down with another girl and a child to come in a way that he never did with her. And although she now has Cliff, offering her just as much if not more, he still can't eliminate or equal David. This won't take you any farther than from here and now to there but it's a pleasant enough interim.