Meg Murry is a central character in the science fiction novel "A Wrinkle in Time" by Madeleine L'Engle. She is a high school student who struggles with feelings of inadequacy and self-doubt. Meg is intelligent but often feels out of place among her peers and family, particularly because of her father's mysterious disappearance. Throughout the story, Meg embarks on a journey through space and time to rescue her father, aided by her brother Charles Wallace and their friend Calvin O'Keefe. As she faces various challenges, Meg learns about courage, love, and the importance of believing in herself.