INDIGNATION, Philip Roth's twenty-ninth book, is a story of inexperience, foolishness, intellectual resistance, sexual discovery, courage, and error. It is a story told with all the inventive energy and wit Roth has at his command, at once a startling departure from the haunted narratives of old age and experience in his recent books and a powerful addition to his investigations of the impact of American history on the life of the vulnerable individual.