Normally, I prefer a horror movie that features good story and characters and operates through subtly and suspense. This movie goes against everything I like in a horror movie, but I still like it. The story involves a group of friends attempting to force their friend to beat her drug addiction cold turkey. They hope to supervise her early stages of withdraw and remove her from the temptation of buying more drugs. Once they reach the cabin, they find several disturbing omens that should signal them to leave. Of course, they do not depart; they even find a book, bound with barbwire and clasped shut. It looks like the sort of thing you should leave alone. Like any horror movie demands, they open the book and read it. Then the chaos and carnage ensues. This movie is somewhat weak in the acting department, and the build-up is a little rushed. At least, it is better than the usual gore movie. Once the horror unleashes, it does not hold back or let up to the very end. It is relentless horror for over one hour straight. It is guilty of countless dumb teen-horror clichés, but it does so without coming off as cheesy. The visuals are completely terrifying. I am not a proponent of scaring people with blood, guts, and violence, but it is so effective here. It is intense horror by force in the vein of the 80s gore-fest, but it is more than that. If the characters mattered more and the acting improved, it would be even better. It is everything I was not looking for in a horror film, but even with the shortcomings, it delivers the scares.