The Bailey School kids decide to investigate when they begin to believe that the new piano teacher who lives in a castle is really a knight planning to take over the city.
Even though they have all come to school in holey clothes, Marvin and his third grade class manage to impress their surprise visitor--the President of the United States.
After Casey Happleton tells him that if he kisses his elbow he will turn into a girl, nine-year-old Marvin experiments and finds himself very confused about his identity.
A wise, understanding grandfather helps Robin, a Jewish child, cope with Christmas; not an easy task when even Sandy, who is also Jewish, is allowed to have a Christmas tree and Robin can't have one.
The kids at Bailey school wonder if Mr. Jolly, the new janitor, could be Santa Claus because he keeps the building as cold as the North Pole and the school building magically clean.