Fourth-Grade Weirdo

Dexter Plum is the only kid in the class who carries a briefcase. How can he hope to get along with a goofy teacher like Mr. Ditzwinkle? But then Mr. Ditzwinkle is accused of theft, and Dexter knows he didn't do it. If Dexter doesn't like the Ditz, how come he's knee-deep in mud, dressed up like a princess, and confronting a ghost – all to defend him?