I'm surprised nobody's ever brought this one up before. This is, in general, a pretty poor serial. Anthony Warde is the only person in the serial who could act at all, and the plot is pretty formulaic, but the real high point comes in chapter three. The hero has been receiving reports of strange noises and ghostly apparitions appearing at an ancient native ruin, and goes to investigate. When night falls, he ventures towards the cave, and sees a strange flashing light coming from the tower, along with an otherworldly whooping noise. Meanwhile, back at the ranch [house], the heroine is alone, and we see a sliding panel in the wall open, and a ghostly hand emerge to extinguish the lights. After that, we see the full figure of the ghost walk towards the heroine, shrugging off bullet after bullet… Now, if Republic had been smart, they would have ended the chapter there. But they felt they had to pad the chapter out to the requisite 13 minutes, so they resolved the situation and inserted a stock footage car-over-cliff ending. What a shame it was, too, because the scene with the ghost and the ruin is the absolute scariest thing I have seen in a serial, bar none. If they had ended the chapter there, it would have been one of the greatest cliffhangers ever, and if I were a kid in the audience in 1946, I would have probably peed my pants and been first in line the next week.