Jim Matthews, express agent in Red Rock, Arizona, and his daughter Alice, are watching anxiously over the bedside of Mrs. Matthews, who is very ill. An express box of money is now left by the stage and Matthews is ordered to guard it overnight. The "Arizona Kid," a notorious bandit, who has followed the stage and watched while they left the box, now gallops back to the rendezvous of his pals, tells them of the easy chance to rob the office and they start at once. Meanwhile Alice has sent her father for a doctor and is all alone with her sick mother. Suddenly a knock is heard, Alice looks out, sees a shadowy figure, thinks it is the "Arizona Kid," a notice and picture of whom is tacked upon the wall, gets her father's revolver, opens the door and admits Broncho Billy, who has stopped for a night's lodging. Alice relieves him of his guns and, in spite of his protests, backs him into a storeroom and locks the door. A few moments later the bandits gallop up and Alice, realizing her mistake, liberates Broncho, who gets his guns, tells Alice to hint that the money is in the storeroom and that he will do the rest. A moment later the bandits, led by the "Kid," burst in the door and cover Alice. Weakly she nods toward the storeroom and, laughing exultantly, the gang rush in, only to be confronted by Broncho with leveled guns. Quickly disarming them, Broncho backs them out the door at gun's point, while Alice gazes after him with the love light shining in her eyes.