New Yorker Mary Higgins Clark has made the mystery/suspense novel an effective purveyor of social questions about women in society. In past novels she has explored family matters—kidnapped children whose lives are threatened by those close to them; a wife's recognition that her husband is a stranger; and, in general, women who discover that their world is not as secure as they thought, that events forgotten from childhood haunt them, and that nothing is as it seems. In We'll Meet Again, the central figure is the wealthy wife of a prominent doctor, a woman seemingly above the reach of the law. She is from Greenwich, Connecticut, a town famous for its privilege, privacy, and aristocratic snobbery. Yet beneath the placid surface of health and wealth lies a malignancy that is killing off patients, and not just the terminally ill or the elderly&mdash...