Dennis's worst nightmare comes true when Walter finds a hand-written journal called The Book of The Menace, literally containing every trick in the book.
Dennis pranks an exhibition opening and accidentally breaks open an ancient Egyptian sarcophagus, paving the way for an epic double bluff as Walter convinces the town they are the victims of an evil curse.
Dennis's elaborate excuses catch the attention of actor Blake Midwinter - and he ends up as the lead in the school play - unfortunately, it's a romantic lead.
The menaces are horrified to learn that the end of term trip to the adventure playground has been replaced with a School Prom - and worse still, Dennis is roped in to helping organize it as a punishment.