A Wind in the Door: A Companion to A Wrinkle in Time

A Wind in the Door is a fantastic adventure story involving Meg Murry, her small brother Charles Wallace, and Calvin O'Keefe, the chief characters of A Wrinkle in Time. The seed from which the story grows is the rather ordinary situation of Charles Wallace's having difficulty in adapting to school. He is extremely bright, so much so that he gets punched around a lot for being "different." He is also strangely, seriously ill (mitochondritis -- the destruction of farandolae, minute creature of the mitochondria in the blood).