There's an emergency in Ratbridge! Only orphan Arthur and his new friends Willbury Nibble QC, Marjorie the inventor, a timid cabbagehead, and some very excitable boxtrolls can save the day! But are they really up to the job? Why has the evil Snatcher taken up residence in Cheese Hall? Who has stolen Marjorie's latest invention? And who knew that rats were so good at removing stains? Find out in this amazing, fun, and highly-illustrated romp!.