Gavin and his sister Torrie aren't thrilled to be staying at Great Aunt Ethel's farm. It's in the middle of nowhere, Aunt Ethel is a little weird, and Gavin is forced to sleep on an old, lumpy feather bed. Then Gavin discovers something worse: the lumps are moving. Torrie thinks he's just crazy—there's no way something's alive inside the mattress—until the lumps begin to hatch…