Beebe brings her new expensive radio to school, in order to impress the other students. When it ends up missing, Mr. Bone threatens to hold the whole class in afternoon detention, if the radio is not returned. Hoping to catch the real culprit, Doug decides to take the case as "The Chameleon," who is a master of disguise. But when Doug finds out that Skeeter has the radio, he'll either have to turn him in or cover for him (thetvdb.com)