<p>The fourth book in the hilarious series from Roald Dahl Funny Prize winning author Philip Ardagh and illustrator of The Gruffalo, Axel Scheffler.<br>Over the years, the Grunts have made more than a few enemies. But fortunately they're all safely behind bars. Or are they? There's been a prison break-out, and three of them are after REVENGE. It's time for the Grunts to go On the Run...<br>This last book brings back some familiar faces from the s...