Greta Zargo doesn't know it, but once again she is about to unwittingly and unknowingly save the world …
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 slowing but surely devouring her neighbours one by one …