Well, this got a lot of good reviews, and we watched it on DVD the other night. But thumbs down from me, I'm afraid.
  The characters are... okay, I guess. The 'scary' invisible bits are... okay, I guess. Neither of them especially brilliant, although at least they weren't overdone. But the plot... What plot? You might as well call this film The Invisible Plot.
  Apart from several problems during the main part of the film (no spoilers here), the ending was a complete unfathomable muddle. With some inconsistencies and, if not impossibilities, at least extremely unlikities.
  Frankly, I'd give it a miss unless you're desperate.