This is Miles and Niles final year at Yawnee Valley Science and Letters Academy and the final book in this series.

Miles and Niles are still up to their fabulous pranks, but this year Principal Barkin wants to be a prankster, too. Principal Barkin’s pranks are very amateurish compared to Miles’ and Niles’. He wants to join their team of pranksters, but no. Then, Principal Barkin wants to repeatedly retain Miles and Niles so their pranks will continue.

Soon there is word the superintendent has past away, only to have Principal Barkin’s father , the former Principal Barkin, become the ‘acting superintendent’. Principal Barkin and Superintendent Barkin do not see eye to eye.

Superintendent Barkin purposely tells Miles he is moving away, even though his mother has asked Barkin to keep it from Miles. This puts a dark shadow over Miles when his mother says it’s true. Miles and Niles are both so discouraged by the news. They both secretly and individually pull off one last prank at Yawnee Valley Science and Letters Academy’s on the night of their graduation dance. Principal Barkin catches them in the prank, but applauds their prank against his father’s 1933 2nd place trophy. Only the three of them (Miles, Niles, and Principal Barkin) will probably ever know the trophy has been changed, and that is fine with them. ” ‘ A masterstroke,’ said Niles, ‘to our whole career.’ ” (205)