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Previously filmed in 1924 by producer Sol Lesser, Harold Bell Wright's popular suspense novel The Mine with the Iron Door was again adapted to the screen by Lesser in 1936. Suckered into buying some evidently worthless property in Arizona, Bob Harvey (Richard Arlen) discovers that he may actually have come into possession of the Mine with the Iron Door, a legendary cache of Spanish gold. Teaming up with detective Dempsey (Stanley Fields) and Marta Hill (Cecilia Parker), a young woman whose family lives on Bob's property, our hero goes a-prospecting, with eccentric archaeologist Professor Burton (Henry B. Walthall) leading the way. In love with Marta himself, the jealous Burton does his best to kill Bob during the expedition, but virtue ultimately triumphs and everyone but the villain strikes it rich. Some of the background music in Mine with the Iron Door had originally been composed for 1915's The Birth of a Nation -- which ironically starred Henry B. Walthall as the hero.