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Diamonds are being smuggled across the border from Mexico in a specially made shoe of a palomino mare. One of the smugglers is killed when the mare runs off. The sheriff blames Trigger for the death. To keep his horse from being destroyed, Roy confesses and goes to jail. The smugglers buy Trigger and put him to work smuggling diamonds. The mare, who had earlier heard a trist with Trigger, foals Trigger, Jr. who Roy, finally out of jail, uses to help capture the smugglers.
In this western, Red Ryder rounds up a gang of horse thieves who have been stealing cavalry horses.
Alone on a trampoline, a boy is joined by an unlikely companion, who in her state of intoxication, shares her own story of isolation.
