In this sequel to Tiger by the Tail, Sarah and Nicholas Fraser are off to zoo camp for the week. Once they arrive, however, they quickly learn that the camp is not what it seemed.

The siblings sleep in a rundown cabin with no running water; Vladimir, the gruff zookeeper, is more at home with his animals than with other people; and the owners are more interested in making a profit than in the well-being of the animals.

When Sarah overhears a conversation late one night and learns about the sinister plans for Kushna the tiger, she and Nicholas once again must spring into action to save an endangered animal.