A Wrinkle in Time is the first in a series of books—which also includes A Wind in the Door and A Swiftly Tilting Planet— often referred to as the Time Trilogy.

L'Engle added a fourth book, Many Waters, to the series in 1986. Each of these books focuses on different members of the Murry family as they continue to wage battle against the powers of darkness that threaten to dominate the universe.

In A Wind in the Door, Meg must help Charles Wallace stop a threatened rip in the galaxy that will destroy earth. Instead of traveling to distant planets, Meg, Calvin, and Mr. Jenkins—the school principal who has caused Meg so much grief—travel within Charles Wallace's cells to battle a virus. They are helped on their quest by a cherubim, Proginoskes, who gives his life for his friends. Many...