L’engle’s work A Swiftly Tilting Planet Planet is a book in the series that started with A Wrinkle in Time. The characters spend their time mystically trying to change the course of history to prevent a nuclear war started by a ruthless, megalomaniac, and violent dictator. Charles Wallace, now a young man, enables his spirit to travel through time and commune with the dictator’s ancestors and other prevalent individuals throughout history to change the present.
The prevailing idea, intent, or thesis for this work is that everything is interconnected throughout history to make the present what it is today. It is clear that this book relates to the idea of the Butterfly Effect, as the small actions taken in the past massively affect the present to change the course of history.