I would give this 3.5 stars. It could be a 4 star, but for me this book was a bit slow to start. It didn't really grab me and suck me in. I had a hard time focusing on it. Now I don't know that it was necessarily the book that was the issue or just all the stress in my life at the time I read it. About halfway through it felt liked it picked up a bit for me though. By the end I was fully engaged, and shocked by the outcome. You will never suspect who the Passerby really is.