As she did in the bestselling novel A Friend of the Family, Lauren Grodstein has written another provocative morality tale, this time dissecting the permeable line between faith and doubt. College professor Andy Waite is picking up the pieces of a shattered life. Between his research in evolutionary biology and caring for his young daughters, his days are reassurringly safe, if a bit lonely. But when Melissa Potter--charismatic, unpredictable, and...