From “Living Memory,” “The Desert as a Garden of Paradise,” and others, Rich’s mature vision engages with the power of time itself: memory and its contradictions, the ebb and flow between parents and children, the deaths we all face sooner or later, the meaning of human responsibility in all this. “Letters in the Family,” for example, is written in the voices of three women—from the Spanish Civil War, from a Jewish rescue mission behind Nazi lines, and from present-day Southern Africa.