I read this when I was in 5th grade and it terrified me! I've been trying to get my kids to read it, for a while, now and they finally did. Well, my daughter did. She's in 4th grade and you know what she said about it?
"That wasn't scary, Mom."
Well, whatever. hahaha
I read it, again, to see if I remembered it correctly. It did seem to be more of a mystery, now, than a scary story. It still scared me when I was younger, nonetheless. ;)
If your kids are into suspenseful books, this would be a good one for them to read. See if they think it's scary! ;)