Brig Harris, a renegade Mexican, casts off his sweetheart, telling her he is tired of her. Harris and a pal now find that a shipment of ore from the Catspaw mine is to be left overnight at the house of Barnes, the town agent. A plot to rob Barnes is instantly laid. Barnes is also a doctor, and Harris lures him to his shack by shamming sickness. In the shack Barnes is overpowered and left tied in the bunk. The two ruffians now ride to Barnes' house and force an entrance. Mrs. Barnes hears them, secures the sack of ore and barricades herself in a number of different rooms, forcing the robbers to break through each successive door with an axe. Harris' sweetheart happens to go to his shack for revenge upon him and finds Barnes. She releases him and urges him to secure a posse and capture the scoundrels before they can secure the ore. Barnes does so and they reach the house just as Harris and his pal are breaking through the last door of a clothes closet in which brave Mrs. Barnes has hidden. The ruffians are hauled off to jail and Barnes takes his wife in his arms with a prayer of joy that she has saved the ore.