Paul Sampson, son of Colonel Sampson, commander of a United States military post on the Mexican border, returns from Mexico accompanied by Captain Huraz of the Federal army. Colonel Sampson's daughter, Marie, is affianced to Captain Clifford of the United States signal corps. Huraz makes a favorable impression on Marie. Clifford watches their friendly relations grow with disfavor. Not only does he dislike Huraz, but he does not trust him. Clifford finally denounces Huraz to Marie. She believes his only motive is jealousy. Madame Golez. a crafty old woman who is well-versed in intrigue, is entrusted with a message to Huraz. After a number of narrow escapes from rebel pickets she penetrates the American lines and delivers the message commanding him to obtain a copy of the United States signal corps cipher. Huraz uses Marie as his tool in surveying the camp of the signal corps. Then one night Huraz enters Marie's apartments and steals a complete outfit of her clothes. Madame Solez disguises herself as Marie and with Huraz steals into the camp of the signal corps. Clifford is awake, thinking of the turn his love affair has taken, when Huraz and Madame Golez creep into his tent. In the fight which ensues Clifford observes a woman whom he mistakes for Marie, steal a copy of the code. The woman makes her escape. Huraz, however, is mortally wounded by Clifford. Clifford gives the alarm and begins the pursuit in an automobile. After a hard chase he overtakes her and regains possession of the code. He returns to the camp and accuses Marie of aiding Huraz in his plot by furnishing a disguise. Vindication, however, comes from an unexpected source. A few moments before he expires Huraz confesses that he stole the clothes from Marie's room. Clifford is touched by Marie's sincere repentance.
