When Charles Wallace Murry goes searching through a "wrinkle in time" for his lost father, he finds himself on an evil planet where all life is enslaved by a huge pulsating brain known as "It". How Charles, his sister Meg and friend Calvin find and free his father makes this a very special and exciting mixture of fantasy and science fiction, which all the way through is dominated by the funny and mysterious trio of guardian angels known as Mrs Whatsit, Mrs Who and Mrs Which.