Someone has just blown up the biggest cheese factory in town, and Detective Inspector Octavius O'Malley, of the Rodent Police is on the case.

Even as the steaming globs of cheese are still running down the walls, it becomes clear that there is something very strange about this case and something stranger still about Octavius O'Malley himself! Before this journey is over you will meet the most evil rat in the world; take a strange trip through the sewers and over the rooftops of town; and discover a hidden diary in a most unexpected place. there will be a dangerous train journey, two kidnappings, three narrow escapes and a poisonous plot that threatens to destroy Octavius O'Malley's world forever. And as if that weren't enough, there is a fat ginger cat lurking in an alley... Ages: 9-13