Synopsis:
A serial killer is on the loose in the area around a decommissioned psych hospital.
Review:
"Plodding" doesn't describe the pace of the film accurately enough. Arthritic plodding from a Galapagos tortoise who's lost his lust for life, perhaps. Eventually, you apply Law and Order logic and guess the biggest name in the cast as the killer because there's nothing that eliminates them from the list of possible suspects.
The tension (and I use the word loosely) is based on the idea that perhaps the villain is the protagonist and you're not being shown that particular view, like the lame ending of a certain shitty French horror movie. Up until the very end, it could be either of two characters. The writers pick the one that makes the audience not feel cheated after trying to have them sympathize with the lead chick for ninety agonizing minutes.