Two cousins, Summy Skim and Ben Raddle of Montréal receive word that their uncle, Josias Lacoste, has passed away and left them a legacy: his gold claim on the Forty Mile Creek in the Klondike of the Yukon Territory. Skim and Raddle travel to the Yukon with the intention of investigating and selling the claim, or so Summy Skim believes. His cousin Ben Raddle, an engineer, has a different idea. He convinces his cousin that they should work the claim and see what comes of it. They encounter trouble with a neighboring claim owned by Americans, the border, which is in dispute, passes between their claims. Everyone loses out when disaster strikes, but the cousins get a deathbed confession from a Frenchman that they helped and he gives them the location of a volcano filled with gold.