SpaceAce

This has been driving me nuts for like fifteen years. I once read a book that centered around a family with a youngish son who turns out to be an evil little bastard. He gets kicks from torturing things, holds bizarre sex rituals and generally terrorizes his family and the world at large. He also, at some point in the book, develops powers which allow him to control sand. He makes super-strong sand monsters to do his evil bidding.

I am pretty sure the above is accurate and I am pretty sure the boy's name was "Paul". I _thought_ the book was called "Sandman" or something like that. I've also tried searching for "Bad Seed" and various other things I remember from the book but I CANNOT FIND THE DAMN THING.

So, it's a book wherein an evil little boy, who may have been the direct spawn of Satan or a demon, come to think of it, grows gradually more powerful and does worse and worse things, which include creating sand monsters that tear people apart with their bare sand hands.

Can anyone tell me what book that was?

Thanks,
SpaceAce