Basically, this book explores the history of humanity's relationship with Pluto. From discovery, to Disney's hopping on the new planet (at the time) bandwagon, to the AMNH's scandalous reclassification in its exhibits, and eventual demotion to dwarf planet. Offers a look into how people can get let emotion get the better of them on even such mundane matters as the scientific definition of celestial bodies.
As this book was written and published several years before New Horizons' encounter with Pluto, you won't get any of the really cool photos that probe produced nor speculation as to what it all means.
This is the first book by Tyson that I've read despite my enjoyment for how he talks about science. His normally prolific enthusiasm seen during interviews is tempered here, though you can catch glimpses of it from time-to-time, including the essay he wrote defending the AMNH move that landed him in hot water with Plutophiles. The addition of the satirical cartoons was a good move.