A Swiftly Tilting Planet by Madeleine L'engle

"In this fateful hour

I place all Heaven with its power

And the sun with its brightness,

And the snow with its whiteness

And the fire with all the strength it hath,

And the lightning with its rapid wrath,

And the winds with their swiftness along their path,

And the sea with its deepness,

And the rocks with their steepness,

And the earth with its starkness,

All these I place

By God's almighty help and grace,

Between myself and the powers of darkness!"

- Patrick's Rune

As Meg's mother in law, Mrs. O' Keefe uses this rune one cold Thanksgiving night, the powers of darkness surround the Murry family. There is a threat of nuclear war by the dangerous Madog Branzillo, and Mrs. O'Keefe tells fifteen year old Charles Wallace that he must find a way to stop Branzillo by using the rune. Charles takes her very seriously, even though she calls him Chuck, and begins a journey through space and time, using this rune as a guide to find the Might Have Been that created the threat of nuclear war. Although he goes alone, his older sister Meg, goes with him by kything, being with Charles in spirit, helping him if she can and watching over his dangerous task, to change and restore balance in time. Charle's companion is the unicorn Gaudior who can ride the wind to different times in the same place. He guides Charles to learn through time by kything or becoming different people over the course of history, until he can find the answer to the past and change the future. But they are not alone, the evil Echthroi are trying to prevent them from changing history, and they will stop at nothing to destroy Charles Wallace and Gaudior as they question human nature and discover the event that caused Madog Branzillo to be. 

This was my favorite book out of the trilogy when I was a kid. Charles Wallace is an amazing character, and his purpose in the story is always great. It was fascinating to watch Charles and Gaudior slip in and out of time, and learn how humans evolved throughout the years, and how the rune was passed from generation to generation. I recommend this book to anyone that loves A Wrinkle in Time, and epic adventures that can change the course of the future.