Another agent sent by the Eagle arrives in the pueblo, this time smuggling jewelry to finance the conspiracy. Carlos Murietta, an Argentine who is contemptuous of the locals, particularly Sergeant Garcia, visits a tannery run by Jose Mordante. The two men discuss the disposition of the gems, including a famous piece known as "The Cross of the Andes", which were stolen from churches in Argentina.

Expecting another shipment of jewels, Murietta goes to inspect the tannery where they will be stored. There, he spots Pasqual, a peasant who lives there, and whips the old man until he leaves. The shipment arrives accompanied by Dolores Bastinado, recently arrived in the pueblo, who attracts the attention of Sergeant Garcia.

Determined to find the missing jewels, Diego and Bernardo visit a local padre in the hopes he can assist them in their quest, but the trip is to no avail. Later, when Carlos Murietta complains to Sergeant Garcia about the missing trunk he had stored at the tannery, Diego is convinced more than ever that the jewels were hidden by Mordante before his death.

Another shipment of stolen jewels arrives in the pueblo, and Dolores Bastinado unwittingly allows her brother, Pogo, to deliver the cargo to the Murietta brothers. The trunk slips and breaks open, and Pogo spots several of the gems. He realizes the men will try to kill him to protect their secret, but he is seized before he can flee. The Muriettas bind and gag him, then hide him when they hear Sergeant Garcia arriving.

Anna Maria Verdugo returns to Monterey from San Francisco and becomes the object of Ricardo del Amo's affection. This friend of Diego's is an incurable practical joker. Ricardo realizes that Diego is also attracted to Anna Maria and hopes to lessen the competition by having some fun at his friend's expense.

Ricardo asks for Diego's help in winning Anna Maria's heart, for he feels Zorro is too much competition for the two men to overcome. If they can make it seem that Zorro is seeing another woman, Anna Maria will scorn him, thus dropping the field of suitors to a more manageable size. Ricardo plans to accomplish this by dressing as Zorro and serenading Anna Maria's cousin, Milana del Carmen.

Diego doesn't know that Ricardo has developed a hatred for Zorro. He makes matters worse when he substitutes a block of wood for a box of chocolates intended for Anna Maria. When she opens her present and Ricardo sees the wood, complete with a carved "Z", he decides to kill his unmask his foe.

Ricardo leaves town but causes another problem for Diego before he goes. Still infatuated with Anna Maria, Ricardo tells her that Zorro would unmask himself if he really loved her. The problem is, Diego does love her, and thus begins to consider turning himself in. The governor offers the outlaw amnesty if he will surrender himself at a public ceremony.

A Chinese boy escapes from a ship in San Pedro's harbor and tries to hide in Los Angeles. He is unable to seek help, for he speaks only his native language.