From Amazon.com:
Fifteen-year-old Charles Wallace Murry, whom readers first met in A Wrinkle in Time, has a little task he must accomplish. In 24 hours, a mad dictator will destroy the universe by declaring nuclear war--unless Charles Wallace can go back in time to change one of the many Might-Have-Beens in history. In an intricately layered and suspenseful journey through time, this extraordinary young man psychically enters four different people from other eras. As he perceives through their eyes "what might have been," he begins to comprehend the cosmic significance and consequences of every living creature's actions. As he witnesses first-hand the transformation of civilization from peaceful to warring times, his very existence is threatened, but the alternative is far worse.

I'm not much into sci-fi but it had some interesting concepts.

Good young person's book

#3 in L'Engle's Wrinkle in Time series. Still an interesting fantasy series.

American book award winner, very good book and easy read.

In this companion volume to "A Wrinkle In Time" and "A Wind in the Door", 15-year-old Charles Wallace and the unicorn Gaudior undertake a perilous journey throught time ina desperate attempt to stop the destruction of the world by the mad dictator Maddog Branzillo.

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this isn't the right cover for the book, even though this is what showed up when I put in the ISBN. It's an older copy

A classic by Madeline L'Engle. One of the series which begins with A Wrinkle In Time.

cover is different

Beautiful cover illustration on this mass market reprint of a classic.

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