What's for Dinner Mr Gum?

Well, shabba me whiskers! Mr Gum's back! But what's he up to this time? Oh, dreadful things my friends, dreadful things indeed. Seems he's found himself a brand new treat - rancid kebabs just dripping with dirty grey sauce. And he just can't get enough of them. He's gotta have more! More! LESS! I mean, MORE! But not everyone's too happy about Mr Gum's new dinnertime arrangements and soon the town of Lamonic Bibber is gearing up for war. Can Polly and her friends save the town from being torn apart? Will Mr Gum's hunger ever be satisfied? And who on earth is Thora Gruntwinkle?