This Halloween was going to be great. Kerby and Fenton had plotted the perfect scare for mean Mrs. Pembroke, and Kerby's cousin Gay had even agreed to help. But then Gay finds Kerby's Feats O' Magic Chemistry Set, and persuades the boys to show her a trick. What a disaster! Before they know it, Kerby sprouts a beard, Fenton grows a mustache--and poor Waldo the dog loses all his fur! Something went haywire, and the boys have to find a remedy. Because if their parents find out what they've been up to, they'll take away the Feats O' Magic Set, and Kerby and Fenton will be stuck with whiskers forever. Then things will really start to get hairy!