The new children's book from No. 1 bestselling author David Walliams - a fantastically funny tale illustrated by artistic genius, Tony Ross. WELCOME TO THE ISLE OF MULCH... This little island is home to a large number of horrible grown-ups. The school, the local park, the toy shop and even the island's ice-cream van are all run by awful adults who like nothing more than making children miserable. And the island is owned by the most awful one of all - Aunt Greta Greed! Something needs to be done about them. But who could be brave enough? Meet Ned - an extraordinary boy with a special power. SLIMEPOWER!