The Grunts on the Run, Philip Ardagh, illustrated by Axel Scheffler
Over the years, the Gruntshave 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.
This last book brings back some familiar faces from the series and solves a couple of mysteries too.