The back of this book says that its about a black hole falling to the core of the earth and the chaos that insues. This is true, but only in part. What makes this story truly compelling is the way Brin includes the stories of everyday life: 3 teenagers striving to make their mark on the world; one woman determined to save it from humanity; and many more. Brin actually created an entire believeable society about the core of the story (no pun intended) and makes it truly interesting. When I was 400 pages in this book all I could think of was how happy I was there were still 300 more to read.