In the early eighties, the peaceful, reclusive life of poet and writer Alice Walker was interrupted by the appearance of three extraordinary gifts: a widely praised best-selling novel (The Color Purple), the Pulitzer Prize, and an offer from Steven Spielberg to make her novel into a film that would become a major international event. This last gift, which Walker identifies as "the knock at the door," led her into the labyrinth of a never-before-experienced...