There has certainly never been another book of this type. When the threat of a life-ending World War III arrives on Thanksgiving Day, Charles Wallace (with the help of his sister, Meg) and Gaudior, the unicorn, must save the world by traveling back in time. It may sound far-fetched, even corny, but the Madeline L'Engle presents it, it is nothing but wonderful. Though the world 'joy' appears a little too much, the story is a thrilling, interconnected fairy tale/science fiction story with a slightly religious aspect that takes you into the lives of an early American Indian, a sickly young writter, a teenage colonist and more, but never looses the main plot.