The gorilla in the story is an unobservant zookeeper is followed home by all the animals he thinks he has left behind in the zoo.

"Someone is trying to hunt FunJungle's Asian greater one-horned rhinoceros, and twelve-year-old Teddy Fitzroy is on the case"--

For once, operations at the enormous zoo/theme park appear to be running smoothly (except for the occasional herring-related mishap in the penguin exhibit) and Teddy Fitzroy is finally able to give detective work a rest. But then a local lion is accused of killing a famous dog--and the dog's owner, an inflammatory radio host, goes on a crusade to have the cat declared a nuisance so it can be hunted. However, there's evidence that the lion might have...

When Teddy Fitzroy is blamed for kidnapping Kazoo the Koala, Teddy realizes he must find and bring Kazoo back to FunJungle--or else Teddy will be sent to juvie as a koala-napper.