Here on Io - hellish moon of Jupiter - men mine ore to satisfy the needs of Earth. They are hard men, loners for whom the Company provides the necessities: beds, food, drink and women for hire. Now, in apparent suicide or frenzied madness, the men are dying.
Federal Marshal William T. O'Neil is determined to find out why. In this pursuit of the truth, he will battle powerful enemies who don't want a do-good lawman getting in the way of production.
And amid the mining town's corruption and apathy, he will have to battle them alone.