When Arthur is cornered by the frightful Snatcher and his men, there seems to be no way out. But unlikely help is at hand in the form of a retired judge, a timid cabbagehead, and some very excitable boxtrolls.
It's monsters to the rescue!
Arthur and his rat and his pirate friends are on a mission – to save the kidnapped underlings and to thwart Snatcher's evil plans. But do they dare venture into the sinister Cheese Hall itself?
And if they do, what - and who – will they find there?
There is trouble in Ratbridge - both above ground in the town and underground, where the boxtrolls and cabbageheads live. And the awful Snatcher has plans to make the trouble oh so very much worse...
Can Arthur and his friends summon up all their cunning and save the day?