From back of book:
They're gruesome! They're ghastly! They're REAL MONSTERS, and they're learning how to scare the pants off of you. Ickis,Oblina, and Krumm, three young monsters, attend the elite Monster Academy. Here they are honing their skills in the hope of one day being perfectly awful! Halloween is the most wonderfully hideous day of the year for all the young monsters. But this one is especially horrendous when Ickis and a real human boy named Nicky accidentally trade places.