Honestly, I never really liked thrillers. It always made me think of movies where they hop out screaming, and then you pee your pants. It's just not my cup of tea.
But books can't really jump out and scare you that way, they can present to you truly shocking situations that make you eager to read more, or sometimes even need a break to process your feelings.
This book does both of those things. It's told through the narrative of two people, the anonymous girl, and Dr. Sheilds.
I loved all the twists and turns this book threw at me, and how I felt after I read it. It grabbed a hold of me and didn't let go until it was over. I would sit down for dinner wondering what would happen next.