Wow! This is the second book that I've read by Greer Hendricks and Sara Pekkanen and I am hooked on this dynamic duo! Jessica is a single girl with a struggling career trying to make it in the big city. Jessica has a sister who needs special medical attention due to an accident as a child and Jessica feels responsible to support her family in taking care of her. When she not so accidentally becomes part of a study run by Dr. Shields, her life begins to change. The extra money is exactly what she needs. At first her involvement in the study and her relationship with Dr. Shields seems to be a positive influence on her but things quickly start to change? The chapters alternate between Jessica's point of view and Dr. Shields' notes. Being able to see the story from two points of view made the characters so much more interesting and believable. I could actually see myself in Jessica's shoes and understand why she makes the choices that she does. As I neared the end of the book, it wasn't all that shocking to me until the very end. I thought I had it all figured out, but it turned out that I didn't really know the characters all that well! Those unreliable narrators will get you every time! This book is a real thinker! I could say more but don't want to give it away.