Sergeant trains gorilla bodyguards to defend against the terrorists' increasing attacks. Dr. Bubo and Ursula, who know nothing about it, are fed up with Sergeant's helplessness against the animal-stealing terrorists and take action. But a slip of the tongue misleads them.

Reading Vizsla's crime novels, everyone thinks they are a crime expert, even Doctor Bubo; and since Sergeant is still unable to unravel the series of murders committed in the poultry yard, he takes action himself with some help.