Meg Murry is one of literature's most enduring young heroines  - stubbornness and all. Meg Murry and her little brother, Charles Wallace, have been without their scientist father, Mr. Murry, for five years, ever since he discovered a new planet and used the concept known as a tesseract to travel there. Joined by Meg's classmate Calvin O'Keefe and guided by the three mysterious astral travellers known as Mrs. Whatsit, Mrs. Who and Mrs. Which, the children brave a dangerous journey to a planet that possesses all of the evil in the universe.

Meg joins forces with three mysterious celestial beings to battle the forces of evil so she can rescue her father, save humanity and find herself. In the end, we know two things for sure: 1. Love CAN overcome evil and 2. There IS such a thing as a tesseract.