It's a perfect example of a YA book that can be enjoyed by adults. YA books often are allowed a bit more creativity and character depth and emotion than adult thrillers, so you really get a feel for how a horrific post-apocalypse might be with this one.

This has been my longtime favorite novel, not because it's profound or moving, but because it fully pulled me into its strange and twisted subterranean world. I found my imagination returning to the story for weeks after reading the book.

I might be biased...but this is a fantastic book. Best of my three published.