I'm only docking a half star for plentiful plot holes, even though I'd almost argue that they can be reinterpreted as a commentary on plot holes in slasher films. As a plot synopsis, this movie is trope central, but like Scream and Cabin in the Woods, it's the twist that works. In this case, it's not the script but the cinematography, which is MASTERFUL. Wouldn't work without the excruciating gore (which earned it a rare Unrated rating from the MPA). The tension is thick, harrowing & entrancing.