Combining theology, fantasy, and science, it is the story of travel through space and time to battle a cosmic evil. With their neighbour Calvin O’Keefe, young Meg Murry and her brother Charles Wallace embark on a cosmic journey to find their lost father, a scientist studying time travel. Assisted by three eccentric women—Mrs. Whatsit, Mrs. Who, and Mrs. Which—the children travel to the planet Camazotz, where they encounter a repressed society controlled by IT, a disembodied brain that represents evil. Among the themes of the work are the dangers of unthinking conformity and scientific irresponsibility and the saving power of love.