This film is all-out tense from start to finish - if you liked the claustrophobic bookend-scares of 'Vacancy' then this would be a film for you, at least in terms of keeping you covering your eyes for the next jump.
The film is divided into four sections; the first three tell the separate stories of the three protagonists who end up ensnared by the lead villain, a depraved schoolfriend who (seemingly for no reason) has it in for them. The first three sections make good use of light and sound to maximise fright and tension, particularly in the evil clown sequence, though they give the plot a disjointed feel.
The fourth and longest section features the girls trapped in a cavernous underground mental institution and the plot reverts completely to Saw-style torture porn.
There are some hideously gaping plot holes - why would the trucker in section one be taking a random girl to rehab? If the police and investigators had discovered the underground cavern as the film leads us to believe, why was backup not called when they ran into trouble? Why was the psychiatrist interviewing the girls in supposedly safe rooms that then led out directly back into the caverns within which the clown was lurking? In section three when Lisa sneaks into the 'hotel,' how does the villain double back and beat her to the asylum floor she finds herself in, when the film depicts her running directly up there?
The film is good fun for a rainy saturday night and will certainly give you some all-out frights, but ultimately this is let down by its poor plotting - Saw without the gore.