A second-grader puts the willies into a first-day first-grader in this very fun mock thriller. “She might look human, but don’t be fooled. She has a purple tongue. She craves earthling baby teeth.” And, of course, our narrator, the self-same first-day first-grader, has got a loose tooth. Well, she isn’t going to open her mouth on any account. Except she does and out pops the tooth; likewise, out pops a really nice first-grade teacher. McGhee keeps the dialogue crisp, bringing out the sweet gullibility of the first-grader and the second-grader’s mischief-making. Bliss’s artwork gives the story additional buzz, like a shot of espresso, in both the immediate interpretation and in a brilliant company of sly marginalia, hitting toothy notes that sit comfortably between Charles Schulz and Charles Addams. (Picture book. 4-7)