Joe comes upon a gunfight over the Chinese girl Jem Sing. Gen. Shen Ti has brought her from China to marry him. Ti is starting a new opium business in Mexico and is hoping to capture the US market. Joe takes Jem Sing to Laredo as she wants to stay with him as his servant for saving her life. Ti learns she is with Joe in Laredo so he kidnaps them slightly wounding Parmalee. At their suggestion Parmalee decides that is is time for Erik and Chad to take a vacation in Mexico. They take the place of two mobsters coming in from San Francisco but Ti uncovers their ruse. He plans to behead all three Rangers to celebrate his wedding.