On a volcanic island surrounded by shark-infested waters is The Cruel School, a school for wicked children that no one ever returns from. When Larker is sent to this dismal place, she quickly becomes suspicious of science teacher Doctor Doktur and his Monsterfication Machine. With rescue out of the question, Larker must save herself before she finds herself face to face with the Megamonster. David Walliams is the author of numerous bestselling children's books including Demon Dentist, Billionaire Boy, Gangster Granny, The Boy in the Dress and The World's Worst Children, and often collaborates with artist Tony Ross. In Megamonster, Walliams and Ross have created the perfect summer read for children that is sure to be popular for many years to come.