Kat and her brother go to stay with their mother who they have not seen in years. At first they are not sure about living in a zoo particularly when the animals seem more important to their mother than they are. Then to make matters worse Kat starts to experience nightmares and other strange things.
Jamie wakes up during the night, hears a growl, and sees a pair of animal eyes. He turns on the light and only his sister is there. Kat's room is trashed and her mother has her checked by a doctor but nothing is found. Jasmin thinks Kat might be a were-tiger, but skeptical Jamie isn't sure, maybe she is a were-hampster or something. They decide to put vegetarian Kat to the test by putting some raw meat in her room and see if she eats it.
Jasmin and Jamie try to cure Kat but get themselves into a dangerous spot until Wild Kat helps them.
Wild Kat has a fit and a rare black cockatoo goes missing.
Jamie asks his mother's friend, the reporter Marcus Flynn, to investigate the disappearance of the black cockatoo, but when he sees Wild Kat in action, he becomes interested in a different story.