At the end of his fifth journal, Charlie Small rocketed out of the strange and dark Underworld, over desert sands and a snowy white mountain range. With a table cloth over his head and a cushion strapped round his bottom, Charlie parachuted right into the middle of a small, swampy island.

Clutching a mainly blank map that's supposed to help him find the infamous Jakeman, he sets off for the next island, only to find himself face to face with a slimy, stinking, roaring swamp monster . . .

Will Charlie manage to slip through its gloopy claws?