Meg Murry is a high schooler that lives with Her mother, baby brother(Charles Wallace), and twin brothers. She has a high IQ but she gets bad grades.
Mrs.Whatsit, Mrs.Who, and Mrs.Which take Charles Wallace, Meg, and Calvin to the planet Camazotz(By tesser), where a evil brain called IT rules. IT has Mr.Murry captured somewhere in his planet.
Meg, Calvin, and Charles Wallace manage to find Mr.Murry and rescue him but, Charles Wallace loses himself. IT took the opportunity they saw and took control of Charles Wallace.
Meg returnes to Camazotz to get Charles Wallace. Because Charles Wallace was being controlled by IT, he was refusing. But after Meg coaxed him and told him how much she loved him. Charles Wallace broke free of IT.
I love you so much!
Meg and Charles Wallace tesser back home. Her family is re-united, and Meg is a lot happier and does way better in school.