A Wind In The Door by Madeline L’Engle continues A Wrinkle In Time, the first Time Quintet series book.
Meg’s little brother, Charles Wallace is having a hard time in school and getting beaten up. He is also deathly ill and has mitochondritis (where a lot of his farandolae, creatures living in your blood are getting destroyed). Meg, Calvin O’Keef, and some interesting new characters have to save Charles Wallace somehow , but how?
Its a page turner just like the first book. Don’t miss it.