Having purchased some mining property in Mexico, William Kern leaves to look over the investment, accompanied by Herbert Brennan, his engineer. Julian Romero and his orphaned daughter Bonita entertain the businessman and his engineer on their visit. Herbert finds much to admire in Bonita. Herbert and his employer find the property in excellent condition and Mr. Kern arranges to have Herbert placed in full charge of the works. That night as Herbert is trying to get to sleep he is disturbed by the strains of a guitar outside the window. Angrily he throws a boot out the window at the intruder, hoping to drive him away. However, the musical caller, Francisco Sanchez, is a gallant suitor for Bonita's hand. He accepts the blow from the boot as an insult, and hurries to Herbert's room to demand vengeance. He forces the latter to engage in a duel with him, and the two are hard at it and are only separated by Bonita and the rest of the household. A revolution is started in the country surrounding the property, and Sanchez accepts a commission with the revolutionists. A year passes. In spite of troublesome times, the mine property proves to be successful, and Kern pays a visit to the property, accompanied by his daughter Dorothy. The homesick Herbert is quickly captivated by the girl from "home," and his growing interest in her is watched with jealousy by Bonita, who has fallen very much in love with Herbert. All railroad lines have been disrupted by the revolutionists, and Kern and Dorothy are unable to return to the United States. Sanchez tries every possible way to win Bonita, but is persistently refused, and he gets the idea that it is Herbert alone who stands in his way. The insurrectors' supply of funds run low, and in order to raise the necessary money, they decide to capture the mine and hold it for ransom. Bonita, who has overheard the plot, writes Herbert an anonymous note, warning him of the coming raid, but he thinks light of the matter. His companions at the mine, however, persuade him to take the gold from the safe and hide it. Just as they are burying the gold in a secluded spot, they are discovered by John, a Mexican peon, who has been asleep in the brush nearby. He waits until the Americans have left, and calling to his assistance a Mexican comrade, the two carry the gold away. The mine is attacked. Herbert is wounded, and fearing that Kern and Dorothy will be killed, he agrees to surrender the mine. The three Americans are taken captive, and as no gold can be found, the revolutionists hold them for ransom until the gold is discovered. In order to secure their release, Brennan tells his captors where the gold was hidden, but a thorough search fails to locate the hidden treasure. Kern and Dorothy are released, but Herbert is held and threatened that unless he reveals the hiding place of the money by the next day he will be shot at sunrise. Bonita realizes that with Dorothy out of the way, she will stand a better chance to win Herbert, and through her influence, Kern and his daughter are given safe conduct to the border. Through accident, Bonita learns from John of his theft of the gold. His companion is captured, and after a severe whipping, he discloses the whereabouts of the missing money. Herbert is very effusive in his gratitude to Bonita for saving his life, and she begs him to call upon her the next day. That night, while thinking over affairs, he determines that he has had enough of turbulent Mexico, and decides to return to the States. Bonita, making great preparations for the call of her friend, is handed a note from Herbert, in which he informs her that he has decided to return home, and again thanks Bonita for her many kind acts. Poor Bonita is almost heartbroken. But when the gallant Sanchez makes a call and accompanies his pleadings with Mexican love songs, she forgets Herbert, and the brave Sanchez is made a happy man at last.