Kline (Marvin and the Mean Words, p. 641, etc.) lets loose with the further adventures of Harry, who, in the last week of second grade, has become even more of a cut-up than usual. Miss Mackle is apparently spending the day (Kline is somewhat vague on the timing) reading Alice in Wonderland to the class. Harry insists there are invisible Purple People in the room; after he appears to tame a bee and find a lost lunch card with the ""help"" of the Purple People, his skeptical classmates start to wonder about his claims. Harry's announcement that a Purple Person will join them at their class tea party produces the book's only moments of suspense; the climax, in which Harry produces one of the Purple People by throwing grape juice on a classmate, is disappointing; then again, Kline isn't attempting to make grand statements or to pound in any major morals. A silly story that unfolds harmlessly.