You know, I think I prefer the vampire children. At least, then I knew what was wrong and who was the enemy and what to expect.
The book is intensely atmospheric. Fear of the unseen and unknown is more potent than fear of something you can understand. The author built up such a climate of suspense and terror, I was afraid the whole time I was reading the stupid book. The writing was good.
There were many vague elements to the plot, which while adding significantly to the dread and fright already hanging in the air, did not present a clear picture of what actually happened.
The third quarter of the book is a repetition of the second quarter and if the writing hadn't been so good, it would have been a problem.
I don't recommend it, it'll only instill the monster-under-the-bed fear and won't even give you a satisfying conclusion for your trouble.