A surprisingly decent pulp horror outing with its roots (no pun intended) purely in the 1930s: this is based on a contemporary novel which I'm convinced must have been inspired by the Clark Ashton Smith short story The Seed from the Sepulchre (coincidentally one of my favourite stories ever). The story is simple, an age-old tale about naïve teenagers on a holiday from hell, not dissimilar to PARADISE LOST in its own way. Once the characters find themselves trapped in an ancient Mayan temple and at the menace of a most unusual monster it really picks up.
The horror is a neat mix of slow-building fear with graphic surgical gore, a la HOSTEL. It certainly doesn't pull its punches, with one graphic set-piece particularly difficult to forget afterwards. There are plenty of other chilling moments, like the bits involving mimicry or a later scene that literally gets under your skin. The youthful cast is typically dull, with only the German character provoking interest, but that doesn't matter when the story and pacing are so well achieved. It's amazing what a little originality can do: compare this to something like the exceptionally dull PROM NIGHT remake and you'll see what I mean.