Answer:
In the final chapter of A Wrinkle in Time, the children and Mrs. Whatsit return to Earth after their successful mission to rescue Mr. Murry. They are greeted by their family and friends, but Charles Wallace is not himself; he has been taken over by an evil force. Meg realizes that the only way to save him is to use the gift of love that she has discovered throughout their journey. With the help of Mrs. Whatsit, Mrs. Who, and Mrs. Which, Meg is able to reach Charles Wallace and break through the darkness inside him. The family is reunited and Meg learns the power of love and the importance of individuality.
"All right! Team Avatar is back! Air, water, earth, fire---- fan, and a sword!"
- Sokka, The Boomerang Guy