The author writes many books however of this "style" there are 6. You don't need to really read them in any order as a normal series either because they don't necessarily correlate like that. The books are tragedies about different things. Like Glass and Burned are both about people who experience drug addictions and Impulse is a story about people in a behavioral health facility. That's the best way I can describe them. If you're into books with no happy ending these are them! Lol.