Cruising at a 'black sky' altitude of 130,000 feet, in the cockpit of the newly engineered XSO suborbital jet, U.S. Air Force Lieutenant Colonel Dallas Grant reports the explosion of a Poseidon missile just minutes after its successful deep sea launch. But then he uncovers a strange aerial attack by another suborbital craft of unknown origin equipped with military technology thought to be available only to the United States and the Soviet Union. A...