Don Sebastian, a friend of the de la Vegas, is growing impatient at the delay of the stage to Monterey, for he is carrying a purse full of gold and is afraid it may be stolen. While waiting in the tavern with Diego, he makes the mistake of mentioning the gold and is overheard by three crooked entertainers.
Diego asks Sergeant Garcia to place the gold in the cuartel's safe until the stage leaves, unknowingly presenting the thieves with a major setback. To overcome this, Lupita, one of the thieves, pretends to be a fortune teller. She gains Garcia's confidence by telling him she knows he is in possession of a large sum of money, then warns him that someone whom he least suspects will try to rob him that night.
The sergeant reacts predictably by sending the lancers out of the cuartel. By now he trusts no one. When Diego tries to visit him, Garcia also sends him away, preferring to lock himself alone in the strongroom. Lupita and her comrades break into the cuartel, surprise the sergeant, and force him to open the safe. The fake fortune teller reminds Garcia that she did warn him he would be robbed by someone he didn't expect, then turns to leave.
The escape route is blocked by Zorro, who was alerted by Garcia's strange behavior. Lupita pulls out a knife and tries to fight her way free, but Zorro locks the three villains in a cell. He unties Garcia and tells him a man's friends should be trusted over the word of strangers, and then leaves as mysteriously as ever.