A blob of slime has broken out of the prison in which it has been kept for years. As it slithers in escape it slurps up everything in its path. Nothing is safe. Especially not Measle Stubbs. For the slippery stomach has gobbled up a gaggle of wrathmonks, and in doing so has ingested their dislike of Measle. Now the blob is after him. And nothing can stop it. Not Iggy Niggle. Not Nanny Flannel. Not Tinker the dog. But it has enjoyed eating them . . . Can Measle gulp down his fear and beat the Slitherghoul . . . before the Slitherghoul gulps him down?