After discarding their infamous homework machine, four friends, now in sixth grade, find themselves once again at the police station, this time giving testimony about an incident involving a powerful computer chip, a Grand Canyon treasure, and a dead body.

With the peculiar Mrs. Kormel at the wheel, anything could happen on the bus ride to Ella Mentry School, as A.J. and his friends find out on the day they have to go out of their way to pick up "the nude kid."

Ella Mentry School's security guard proves overzealous in his pursuit of a peanut-butter-and-jelly-sandwich thief.

Disaster reigns when A.J. participates in the school's holiday pageant celebrating Christmas, Hanukkah, and Kwanzaa.