I've been fascinated by this story since I heard that balloon bombs existed. This book was very factual, by which I mean it didn't have any gripping storyline that would cause me to recommend it to others, but if someone wants to learn more about fu-go, this is a concise review of the events of the campaign and includes maps created by the American military of balloon landing sites.
Spoilers but not really because these were actual historical events:
In summary, there were six civilians who died on American soil in WWII, and they were all the result of a single explosion, which was part of an enormous balloon bomb campaign carried out by the Japanese. The effort and skill that went into each balloon was astounding, and they were in fact the first Intercontinental Ballistic Missiles in history.
Balloons.
Balloons carrying bombs with strings over the entire Pacific Ocean.
The book gets into the science of it, which made me respect the skill it took, as well as being amused by the absurdity of the whole thing.
The book wraps up with a few pages of responses from the victims' families, as well as some Japanese women who were part of the balloon construction team, which was also interesting and touching. All in all, I liked it and I'm glad my library had it.