Evelyn McDonnell is a storyteller, writing about a storyteller. Her tribute to Joan Didion, “The World According to Joan Didion,” places each of us at the moment we first became aware of the California author. The book delves into Didion’s roles as a woman, mother, spouse, and consumer, even as she remains a bit of a political enigma. All these facets contribute to the complex landscape of Didion’s life and her work as a kind of cartographer for California.