Jack Langdon is sent by a San Francisco company to manage its Santa Clara mine in Peru. Gov. Juan Maria Barada, who disputes the American claim to the mine, means to gain possession of it through intimidation. Barada has his henchman, Miguel Alba, try to bribe and then attempt to kill Langdon, who plans to inform his superiors about the plot. Langdon returns to San Francisco, and after six weeks in delirium in the hospital because of Alba's attack, recovers. He then is told that his aunt has died, leaving him the heir to a woman's seminary in Massachussetts, containing 250 female students. Langdon goes to the seminary, and after the commencement exercises, although he thinks that he is alone at the college except for the caretakers, he comes upon Pepita, Barada's daughter, who is a student at the seminary. She escaped from the clutches of the evil Alba and his mistress, Señorita Del Deros, who had tried to kidnap her from the college. Alba returns for Pepita but he is overcome by ...