Leonardo, the Terrible Monster (Paperback)(Mo Willems)Author Illustrator: Mo Willems Age: 3 5 English Page: 48 Paperback 22. 8 x 0. 4 x 31. 8 cm Leonardo is truly a terrible monster terrible at being a monster that is. No matter how hard he tries, he can't seem to frighten anyone. Determined to succeed, Leonardo sets himself to training and research. Finally, he finds a nervous little boy, and scares the tuna salad out of him! But scaring people isn't quite as satisfying as he thought it would be.