Oh my god this terrified me. This book filled me with so much anxiety that I had to keep putting it down to breathe. The first two thirds of this book were great for me. I loved the way Clarissa was written. It felt so incredibly realistic. I don't know if Clair Kendal has ever been through anything like this, but it wouldn't surprise me if she had experienced being stalked before. It did lose me a bit toward the end and the climax. That was probably all that kept it from getting five stars. For me, the climax was significantly less scary to read than the rest of the book. But all in all, I would highly recommend this book. It made me not want to leave my house for a week after I read it.