Writing with the telegraphic swiftness and microscopic sensitivity that have made her one of our most distinguished journalists, Joan Didion creates a shimmering novel of innocence and evil. A Book of Common Prayer is the story of two American women in the derelict Central American nation of Boca Grande. Grace Strasser-Mendana controls much of the country's wealth and knows virtually all of its secrets; Charlotte Douglas knows far too little. "Immaculate...