Meg Murry, her brother Charles Wallace, and their friend Calvin O'Keefe become involved with unearthly strangers and a search for Meg's father, who has disappeared while engaged in secret work for the government.

Fifteen-year-old Charles Wallace Murry and the unicorn Gaudior must travel through time and space in a battle against an evil dictator who would destroy the entire universe. Includes an interview with the author.