Well, that old roo-de-lally Mr Gum and the hideous Billy William the Third are once more mucking things up for everyone. They're a-schemin' and a-hatchin' an' making their bad plans up on Goblin Mountain. Can the wise old man Friday O'Leary and the small girl Polly make it past the Three Impossible Challenges of Goblin Mountain and save the town from a fate worse than something very bad indeed?