"Hortensia James and Marion Agostino are neighbors. One is black, the other white. Both are successful women with impressive careers. Both have recently been widowed, and are living with questions, disappointments, and secrets that have brought them shame. And each has something that the woman next door deeply desires. Sworn enemies, the two share a hedge and a deliberate hostility, which they maintain with a zeal that belies their age. But, one day,...