Paula Marantz Cohen's triumphant first novel, " Jane Austen in Boca," was an inspired blend of classic English literature and modern American manners. Her new novel heads north to the seemingly quiet suburban town of Cherry Hill, New Jersey, for a comedy that even Shakespeare couldn't have imagined. Carla Goodman is worried. Her husband, a gastroenterologist in private practice, is coming home frazzled because medicine isn't what it used to be. Her...