What is summary of chapter 11-12 in A Wrinkle in Time?

In chapters 11 and 12 of "A Wrinkle in Time," Meg, Charles Wallace, and Calvin face the ultimate confrontation with IT, the dark force controlling Camazotz. With the help of Mrs. Whatsit, Mrs. Which, and Mrs. Who, they realize the power of love and individuality can counteract IT's control. Meg's unique bond with Charles becomes crucial as she learns to embrace her flaws and harness her strength to rescue him. The chapters emphasize themes of courage, the importance of family, and the triumph of light over darkness.