Intrepid, young schoolgirl-turned-reporter Greta Zargo is always in search of a Big Scoop and for once there are plenty of strange goings-on in the usually quiet little town of Upper Lowerbridge. Not only has Aunt Tabitha, the great inventor, gone missing, but weird, wobbling, blob-like monsters are appearing via a very deep hole in Greta's garden and they are slowly, but surely devouring her neighbours one by one.