Once again the Hatford brothers and the Malloy sisters find themselves pitted against each other when embarrassing pictures of the boys turn up in the girls' basement, and the boys try to figure out how to get them back.
D.W. convinces Arthur to have a garage sale after his mother tells him to get rid of the junk in his room, but things do not work out exactly as he had planned.
Will's enthusiasm over his garage sale disappears when he sells something a classmate had given him to someone who plans to give it to the same girl for her birthday.
