Bestselling author Miller (The Good Mother; When I Was Gone) returns with a rich, emotionally urgent novel of two women at opposite stages of life who face parallel dilemmas. Meri, the young, sexy wife of a charismatic professor, occupies one wing of a New England house with her husband. An unexpected pregnancy forces her to reassess her marriage and her childhood of neglect. Delia, her elegant neighbor in the opposite wing, is the long-suffering wife of a notoriously philandering retired senator. The couple have stayed together for his career and still share an occasional, deeply intense tryst. The women's routines continue on either side of the wall that divides their homes, and the two begin to flit back and forth across the porch and into each others physical and psychological spaces. A steady tension builds to a bruising denouement. The clash, predicated on Delia's husband's compulsive behavior and on Meri's lack of boundaries, feels too preordained. But Miller's incisive portrait of the complex inner lives of her characters and her sharp manner of taking them through conflicts make for an intense read. (Jan.)