Usually I don't bother with book reviews, but this time I do think it's worth it. I won't get back my time, but maybe someone else will.
This is Koontz, so I wasn't expecting literature, just something entertaining to read while on holiday - some of his earlier work fit the bill perfectly. But the writing is so bad as to be barely functional.
It isn't scary, as whatever one is supposed to fear - basically it's the dark plus bogeymen - is kept so vague and abstract till it's almost over. Could work well enough, if it connected at a subconscious level, but it does not.
The characters are stereotypes with no depth at all. There just had to be something special or unusual about every one of them, though, which makes them seem even more unreal and forced. One just doesn't care for any of them.
It doesn't have a plot to speak of, it's just a bunch of people getting more and more scared of shadows.
The scifi elements the dust jacket seems to hint at, aren't really there, except as a deus ex machina type of element that "explains" the whole mess at the end, Still lots of plot holes and WTF moments.
At around 80% it gets mildly interesting but by that point what plot there is has become so blindingly obvious as to be insulting.