Sired by a farmer's kelpie on a dingo mother, Dusty has been raised by Tom Lincoln since he was six weeks old. He is magnificently swift and alert - the ideal sheep dog, winning sheep dog trials and a trophy coveted by farmers near and far. But one evening Dusty, yearning to roam the night bush and sniff the scented earth, yields to the call of the wild. When Tom discovers blood-stained wool on Dusty's muzzle the next morning, he fears that his loyal companion has reverted to the dingo side of his nature.