The Codex, by Douglas Preston probably doesn't qualify as great literature (or even literature?). But you know what? Who cares!
Yes, you can guess how the book is going to end from reading the back of the CD box. And yes, there's the requisite love story as a side plot. And overall, the characters evolve just like you want and expect them to.
But, it was fun to listen to. It was just the kind of story I needed to take my mind off a cruddy commute or looming deadlines at work.
If you want a fun action/adventure story that isn't too deep, give this book a try. It's a fun read.
I give it a 8/10 for being what I needed, when I needed it.