This book. It's about a group of college students who have all been diagnosed with psychopathy and are part of a hush hush study on campus. They aren't supposed to know who each other are but soon three of them end up meeting and two others are murdered. Chloe, though she has another scheme in the works unrelated to the group, teams up with Andre and Charles to figure out if someone is hunting them and who it is. The chapters are narrated by the three of them and it's just bananas to see how they think. I will assume the author did her homework but I don't know enough about the psychology to know if it was accurate. At the very least, it was well written enough to keep me captivated.