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Inspector Davide Rivera and Rex investigate the case of a circus animal trainer who is mauled by a tiger. The death seems accidental until Rex finds out an ultrasound whistle was used to train the tiger to attack.
When an actress is killed, Inspector Rivera and Rex are called to investigate and soon find that a number of people had a motive to get rid of her - including her producer, her co-star, and his wife. Meanwhile, Rex discovers he has a talent for acting.