Although as I said, there is much known to the reader of this book that is not known to the protagonist, it's still the sort of book one doesn't want to say too much about. It pulls the reader in quickly and although, again, we know a lot more than the protagonist does in terms of what's going on, the suspense about how he will respond is strong. A subplot involving the dilemmas that one of the people pulling the strings faces also keeps things complicated.
Most of the time when I book strikes me as like a movie, I don't consider it a good thing. It means that it's all action and cliffhangers and short chapters and not much in the way of character and substance, but this could be a masterpiece of psychological horror cinema in the hands of the right Hitchcockian director, and as short as it is I doubt anything would even need be cut.
Overall: A