A prospector named Jonathan Harvey (Paul Kelly), whose faithful companion is a rough collie named Shep, looks after the family of his late partner, Martha Blake (Ann Doran) and her son Tommy (Gary Gray). After years of digging in the hills of California (where the movie was shot), he finally strikes gold. However, before he can share it with the Blakes, his greedy partner Lin Taylor (Bruce Cowling) kills Jonathan and attempts to lay claim on the gold. He poisons Shep, who nearly dies, and nearly kills Tommy, but ultimately Shep recovers and leads Lin into the mountains, where he falls off a cliff to his death.