Chilling is definitely the word for this story. Funny how easy it is to overlook the obvious choices.

Wow, that was a really chilling story and I loved reading it. I thought that the monster was under the bed, but when the sister checked the room, she did look there. You might want to take out that discrepancy. :) I'm surprised that you don't have more reviews...

Ada was trying to keep the piece long enough for them to eat. You should change that part. But whoa! That is a story!

bone-chilling would be a good word to describe that.. i'm impressed..