The Emir of Asambana's prize cheetah is sick, and may not be able to race in an important contest with a rival tribe. The Emir threatens to cut off the Wamera reserve from using the water on his property unless Dr. Tracy cures his cheetah in time for the race.

A pregnant black leopard, raised in a circus, is brought to Wameru, even though she has attacked her last trainer and killed her previous litters of cubs. Tracy hopes to change her behavior in the new environment.