I haven't read this one, but I've heard an interview with the author and I'm betting it's a good one. It's a great title, but still not up to Words of the big-footed Giants, by Pigafeta. Brown was part of the team of astronomers who discovered the dwarf planet Eris, slightly bigger than Pluto, sparking a controversy that eventually resulted in Pluto being demoted from planet status. In all likelyhood there are many objects close to the size of Pluto in the solar system, so it was a question of making them all planets or demoting Pluto. Astronomy chose the small-tent approach, preserving the exclusivity of the planets.
Edited to add: For another view of the matter, check here.