Can the twins solve six mad riddles to find Nod's long-lost gold?

It's all-out war with the Knightleigh family, and Edgar and Ellen are rapidly losing ground. But then everyone's attention is diverted by the ghostly hand of fortune: Augustus Nod has launched a treasure hunt from beyond the grave! The race is on, and the twins must solve the riddles and discover Nod's lost golden limbs before the Knightleighs bury the past -- and the diabolical duo with it!