Standard Deviation by Katherine Heiny, 319 pages
Christa recommended this one to me, and she does an excellent job of describing it here. But for those that don't want to click that link: introverted Graham and extroverted Audra have been married for more than a decade and now have an origami-obsessed son. Graham's ex-wife Elspeth suddenly returns to their life, bringing with it plenty of contemplation, confusion, and dinner parties. The characters Heiny creates are incredibly realistic, and while she's a bit too much to handle, Audra in particular is fascinatingly odd. I enjoyed this look at the complications of everyday life. Thanks for another good one, Christa!