Anyone who enjoyed Crank should enjoy this book equally as much. Although "enjoy" really seems like the wrong word, because these books are not exactly pick-me-ups. But they are an interesting look into the all too real world of addiction. Crank and Glass are similar, but Glass is not just more of the same. I'd say that where Crank is a look at a girl transforming from normal teenager to drug-user, Glass is what happens when she is fully in the grip of addiction, even with so many reasons to leave the drug behind (new baby, having already gone through detox, working towards a GED, etc.). Glass is a lot like an episode of "Intervention", but you never hear the happy music at the end to know that the addict went on to live a happy, clean life.