Bella Legrossi and Boris Kleanitoff, the messiest and cleanest monsters in Booville respectively, do nothing but argue until the night of Harry Beastie's Halloween party. Interest Level: K-3 Reading Level: 3.9 ATOS Book Level: 3.2 AR Interest Level: LG AR Points: .5 AR Quiz: 78752EN. Teaching Books: https://school.teachingbooks.net/tb.cgi?tid=934.