She had excuses, if she wished to use them....Her husband had been remarkably handsome in a preppy kind of way--tall, with a thatch of blonde hair that flopped elegantly across his forehead..... "Monogamy" is an unusual new novel by an American legend, Sue Miller. Graham, the affable owner of a Cambridge bookstore, has a roving eye. Though Graham is happily married to an artist, Annie, Graham has big appetites, and he would maybe prefer an open marriage. Graham manages his appetites with an occasional affair; late in life, he begins seeing Rosemary, a friend and recent survivor of a divorce. Elated, sickened, Graham can't help but share the details with a male colleague. "Rosemary waxes herself down there," he says, then he immediately feels repelled by his own tackiness. When Graham dies, Annie begins a standard "mourning process"--or so she thinks. Having spotted an extremely weepy Rosemary at a memorial service, Annie "puts two and two toget...