For the first sixty minutes or so, Haute Tension is an uncompromising, brutal, nerve-shredding, edge-of-the-seat thriller—not surprising since virtually every one of those minutes is a blatant steal from Dean Koontz's brilliant, brutal, nerve-shredding, edge of the seat novel Intensity. Unfortunately, after the hour mark, director Alexandre Aja gradually steers his narrative away from Koontz's novel, presumably in a futile effort to disguise his plagiarism, and the film slowly falls apart, culminating in a ridiculous twist ending that makes a mockery of all that we have seen thus far.
For fans of Intensity, it's a particularly frustrating experience: not just because the Koontz receives absolutely no credit for his work, but also because Aja's handling of the author's material is so good. If only Aja had adapted the whole of Koontz's book (preferably with the author's approval), we might have had one of the greatest horror movies of all time; instead, we get an hour of absolutely stonking stuff (the opening home invasion, in particular, is flawlessly handled and amazingly gory), which are followed by twenty more minutes of reasonably solid cat-and-mouse action, and then that bloody awful finale.
For all the excellent stuff 'inspired' by Koontz, a rating of 9/10 seems fair; but for stealing the plot without giving the author credit and then having the nerve to tack on a dumb ending, I deduct three of those points, leaving the film a final score from me of 6/10. Worth a watch (especially for gore-hounds), but impossible to wholeheartedly endorse.
