The heart of this book is love and what it means to be human. When an asteroid potentially threatens the survival of humanity, four high school seniors with very different experiences of life ponder what their futures hold. The characters first define themselves by their labels (overachiever, slacker, athlete ...) but when they think the future may or may not actually come to pass, and they may only have a few months left before the world really ends, their priorities change, sometimes dramatically. What would you do if days were numbered not only for you, but for everyone?
The author is a musician, who also released a companion album to the book. I really enjoyed the book, but once I listened to the album, I found a whole new layer of meaning and depth.