It started with some missing cobblestones and a bump on the head of one of Rodent City's young police rats.

But this time it's not the mice who are to blame...and even botching the investigation and losing his job can't keep Rodent City's finest detective (self-confessed) from pursuing this case.

A rat has to pay the rent, so Ocko hangs out his shingle as a private investigator. His first client wants him to find her missing son whose workplace has special significance for our doughnut-loving hero.

Could it be that the two mysteries are connected? The villain of the piece might not look familiar at first glance, but a diamond-hard mind like Octavius O'Malley's knows that appearances can be deceiving and that sometimes only a rat can smell a rat...