T.J. and Vince are so into the "Barnaby Boys" books that they dress up like the Barnaby Boys and try to solve the mystery of the suspicious substitute janitor, Earl Raymond. / T.J. receives an old history textbook with a treasure map that leads the gang, Randall, and the Ashleys out to get the treasure. But as they get closer, greed arises and the 4th graders fight for the treasure.