Margaret "Meg" Murry is one of the main protagonists of three of the five books of the "Time Quintet." In the first two books, she is Meg Murry, a student. In the third book, she is Meg Murry O'Keefe, wife of Calvin O'Keefe and mathematician.
She is the oldest child of scientists Alex and Kate Murry. Below average in most of her school subjects but brilliant in maths, Meg is awkward, unpopular, and defensive around authority figures as well as her peers. (She is even called "belligerent and uncooperative" by her school principal.) Although she has the brains to accomplish difficult tasks, she rarely puts her strengths to use. She adores her mother and three brothers, especially her youngest brother, Charles Wallace, and badly misses her missing father. Like many adolescent girls, Meg is unhappy with her physical appearance, particularly her mouse-brown, unruly hair, braces and glasses, and considers herself a "monster" in comparison with her mother. But then she meets Calvin, a boy she falls in love with. She is about thirteen years old, and is a couple of grades below Calvin, who is fourteen years old but in eleventh grade.