Ruskin Splinter is small and thin, with knock-knees, thick glasses and a squeaky voice, and the idea of him taming a dragon makes the whole class laugh. Big, strong Elvis is stupid but he looks like a hero. So who is more likely to get the big part in the school play? But when the mysterious beast, Krindlekrax, threatens Lizard Street and everyone who lives there, it is Ruskin who saves the day and proves he is the stuff that heros are made of after all.