Admittedly, it did build up some pretty terrible scares, but the mystery wasn't that mysterious and frankly it shouldn't have been much of a surprise to anyone, least of all the people investigating the incident. There was the possibility of supernatural occurrence, or completely mundane; from the beginning it's clear that it's not really a supernatural happening, or at least not likely to be. That leaves an impressive two people it could possibly be, which on retrospect isn't all that frightening. This is a film you can watch probably once and never again, which is disappointing; equally disappointing is how the killer isn't developed at all (and barely even has any screen time, nor are they referred to in any way to develop them) until literally the last minute, when it's really too late to build up anything.
As some have suggested, it would have worked far better at half its running time, since there's just far too much padding that adds pretty much nothing to the story. I found the frantic running around at night near the end to be genuinely tense and anxious initially, but eventually it got tiresome; either kill them and be done with it, or advance the plot.
The ending was also pretty ridiculous, I have to say, and seemed supremely implausible in the context, at least of what we can be assumed to know. There's just too much about it that makes the viewer think 'that doesn't make sense' or 'that's just stupid'. What were they trying for? It's one of those films that has a lot of 'fridge logic' with it; too many questions pop up after it's over and you think about it once you calm down a bit, and then it seems really flimsy. Which is a shame, because the characters seem realistic and are well-acted, and overall the film is pretty well-done. But really, it's a one-trick pony and you won't come back to it again. Still, if you have a little over an hour and want a one-time-only scare, this might be the one for you.
As some have suggested, it would have worked far better at half its running time, since there's just far too much padding that adds pretty much nothing to the story. I found the frantic running around at night near the end to be genuinely tense and anxious initially, but eventually it got tiresome; either kill them and be done with it, or advance the plot.
The ending was also pretty ridiculous, I have to say, and seemed supremely implausible in the context, at least of what we can be assumed to know. There's just too much about it that makes the viewer think 'that doesn't make sense' or 'that's just stupid'. What were they trying for? It's one of those films that has a lot of 'fridge logic' with it; too many questions pop up after it's over and you think about it once you calm down a bit, and then it seems really flimsy. Which is a shame, because the characters seem realistic and are well-acted, and overall the film is pretty well-done. But really, it's a one-trick pony and you won't come back to it again. Still, if you have a little over an hour and want a one-time-only scare, this might be the one for you.