Shep Knacker has long saved for “The Afterlife”: an idyllic retreat to the Third World where his nest egg can last forever. Traffic jams on the Brooklyn-Queens Expressway will be replaced with “talking, thinking, seeing, and being” — and enough sleep. When he sells his business for a cool million dollars, his dream finally seems within reach. Yet his wife Glynis has concocted endless excuses why it’s never the right time to go. Weary of working as a peon for the jerk who bought his company, Shep announces he’s leaving for a Tanzanian island, with or without her. Just returned from a doctor’s appointment, Glynis has some news of her own: Shep can’t go anywhere because she desperately needs his health insurance. But their policy only partially covers the staggering bills for her treatments, and Shep’s nest egg for The Afterlife soon cracks under the strain. So Much for That follows the profound transformation of a marriage, and Shriver delivers a compelling novel that presses the question: How much is one life worth?