The sinister siblings, twins Edgar and Ellen, kidnap the pets of Nod's Limb's youngest citizens and turn them into "rare beasts" in hopes of making money to finance future pranks.

As they attempt to decipher a series of clues to buried treasure left by the founder of Nod's Limbs two hundred years before, twins Edgar and Ellen also race to find a cure for their pet, dying from the bite of Ellen's carnivorous plant.

Mischievous twins Edgar and Ellen must thwart the plan of Mayor Knightleigh's wife to renovate their crumbling house, but Edgar has to plot alone when a hairy, one-eyed creature turns Ellen into a model of proper behavior.