When you open a children’s book, it’s not fair to expect the characters to be ready every time. This is especially true if it’s by Hervé Tullet, the New York Times best-selling author of Press Here. When you open the equally inventive Help! We Need a Title!, you find a princess and a pig tossing a ball together until they notice that you, the reader, have arrived. “Hey! Someone’s watching us! . . . And they’ve opened our book!” The full cast of characters appear and realize that—of course—you would like a story.