It's Crimicon - the annual meeting for promising young criminals - and this year it's being held at Crumley's, the dreaded School for Career Criminals, who also happen to be Blaggard's bitterest rivals.

It's not until it's too late to turn back that Milly and Charlie realise that Gruffles, Charlie's devoted but stinky dog, has followed them. Can Milly and Charlie keep their school's reputation as the best school for criminals, steer clear of Dr B L Zeebub, Crumley's evil Head Teacher as well as keeping Gruffles out of harm's way? What is the purpose of the mysterious machine that Zeebub has hidden away in the school's basement? Can Trickery Hackett, an over-friendly Crumleian, really be on their side? Why does the animal-hating Zeebub allow a flock of weirdly large sheep to roam Crumley's grounds? And since when have sheep been CARNIVOROUS?



        Milly and Charlie must use all their skills to find their way through the maze of traps and problems awaiting them at Crumley's, to save Blaggard's reputation and protect Gruffles from the Killer Sheep.