Zorro rides to expose the alcalde's gross tinkering with the market weights, but this time an Indian scout, Grey Wing, is waiting to follow his trail and thus earn the horse he admires as no other, and he is really good. Diego and Felipe drive sheep over the plaza, but the scout picks up the rail, so Diego sends Felipe to lay a false trail riding Toronado, while he offers his services to point out the dangerous new quicksands on the De la Vega estate. The Indian reads every sign brilliantly, till poor Felipe, who can't ride as fast, sees no other way out then hiding ...