Joey "Spider" Storch has a catastrophe on his hands. His mom's new friend, Mrs. Brennerman, is the mother of Mary Grace Brennerman, the most disgusting girl in the third grade! The moms decide to carpool to school. Now Joey has to ride in the same car with Mary Grace, and the whole class knows. Third grade is officially ruined!Joey must devise a plan to break up the moms' friendship. After all, it should be against the law for moms of boys to be friends...