The September book was Age of Miracles by Karen Thompson Walker. As I mentioned before, I haven’t read the book, but I think the premise is pretty interesting. Here’s what Amazon says:
On a seemingly ordinary Saturday in a California suburb, Julia and her family awake to discover, along with the rest of the world, that the rotation of the earth has suddenly begun to slow. The days and nights grow longer and longer, gravity is affected, the environment is thrown into disarray. Yet as she struggles to navigate an ever-shifting landscape, Julia is also coping with the normal disasters of everyday life—the fissures in her parents’ marriage, the loss of old friends, the hopeful anguish of first love, the bizarre behavior of her grandfather who, convinced of a government conspiracy, spends his days obsessively cataloging his possessions. As Julia adjusts to the new normal, the slowing inexorably continues.