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

Nukilik, a polar bear, joins Wangari, a pangolin with a genius for engineering, Murdock, an extremely sarcastic narwhal, and Arief, an orangutan with a big dream, to safeguard other endangered animals.

Brenna, Maggie, and Zoe go to Florida to visit a manatee rescue center, where they learn about these endangered marine mammals.

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...