The people of Ratbridge are going crazy for the amazing miracle medicine, Black Jollop. But disaster strikes when it looks as though the powerful pick-me-up is running out! It's up to Arthur and his friends on board the Nautical Laundry to journey afar to gather the secret ingredient. It's excitement ahoy in this madcap story, full of hilarious and outrageous characters, including the loveable Boxtrolls who are now stars in the Oscar-nominated film The Boxtrolls.