This series follows the lives of Meg Murry, her youngest brother Charles Wallace Murry, and their friend Calvin O'Keefe as they try to save the world from evil forces. The remaining Murry siblings, twins Sandy and Dennys Murry, take up the struggle in one volume from which the other protagonists are largely absent. A further book about Polly O'Keefe, the eldest child of Meg and Calvin, features several characters from the other novels and completes the Time Quintet.
