from back cover:
"Gretchen and her stepbrother, Clark, hate staying at their granparents' house. Grandpa Eddie is totally deaf and Grandma Rose is obsessed with baking. Plus, the live right in the middle of a dark, muddy swamp.
Things couldn't get worse right?
Because their is something really weird about Grandma and Granpa's house - something odd about that room upstairs. The one that's locked. The one with the strange noises coming from it. Strange growling noises..."