The story:
The Phantom is listening to disturbing news from Walker County in the American mid-west (six mutilated corpses have been dug up next to his mesa hideout) when the mesa intruder warning goes off in the Skull Cave. Suspecting a possible link between the two, the Phantom travels to America to investigate.

On arrival at Walkertown near the mesa, the Phantom makes a disturbing discovery in the temporary morgue holding the corpses: all the bodies have markings that suggest that a devil-worshipping cult is in operation in the area, possibly using the mesa as a base...