"Four months after the collapse of defective levees in New Orleans, a white man and his teenaged son, having lost their house to the flood, rent half of a shotgun duplex from an African-American woman, whose father has lost his home in the Lower Ninth Ward and moved in with her. Even living under one roof, though, the two families find a wall still runs between them. But like the city's levees, can it, too, be breached?"-P. [4] of cover.