Jim Murray, station agent at Martel Junction, receives an express package from an Omaha bank containing $25,000 in currency, with orders to deposit it in the Martel bank. Murray finds the last stage for Martel has gone and takes the money home with him to guard it overnight. Two tramps, who have been watching him, follow him into the house, bent on securing the package of money. During supper Murray shows the package to his little daughter, Audrey, who delights in the pretty colored paper. Leaving the package with her, Murray goes to the stable to feed the horse, is waylaid by the tramps and knocked unconscious, Mary, the older sister, discovers the presence of the tramps as they peer through the window, hides the package in the bottom of a chair, seats Audrey on it, with instructions to guard it while she rides for the sheriff. Forcing an entrance into the house the tramps find the two children apparently asleep and go into the bedroom. Instantly Mary runs out, mounts her horse and dashes madly down the moonlight trail toward town. Finding Mrs. Murray ill in bed the ruffians threaten her life if she refuses to tell where the money is. Little Audrey now begs them not to harm her mamma, and agrees to lead them to where the package is concealed. Pointing to a spot in the floor in the adjoining room, the little heroine says the money is hidden under the boards, then coolly sits on the express package concealed in the chair and watches the robbers as they hack away at the stout boards and mutter curses as their knife blades snap. Meanwhile, Mary is leading the posse back at a furious pace up the moonlight trail and the two ruffians are suddenly dumbfounded when the enraged cowboys burst in and drag them away, leaving Murray to gather his little heroines in his arms and give thanks for their saving the express money at the risk of their lives.