I won this book on a Goodreads Giveaway and approached the book with an open mind, as I don't normally read children's books. This book does read like something I would have read as a kid, though. The premise of the book centers on human guardianship of Earth and how aliens interact with these human guardians in the face of a human history which is much, much bigger than anticipated. The book switches between 1947 and 2020 and two ensuing sets of characters, and for the majority of the book, we're not sure how the two times and character sets interact, but the author ties everything together well at the end. This book didn't take the approach I anticipated - alien invasion because "aliens are automatically evil", which honestly is an overused trope, and I was relieved that that wasn't the approach taken here. It did intrigue me enough to consider reading Part 2.