I've read this book and didn't find it that disturbing, maybe that's just because I'm immune to the scary stuff now, I don't know.
@ Univerze, it's not too bad once you get into it, maybe try again?
In truth I can't think of any books that truly disturbed me, not in recent years anyway. I remember when I was younger there was a Goosebumps book about ventrilaquist dummies that freaked me out but I've never liked them anyway!