Strange sights in the sky have been reported periodically throughout recorded history. Perhaps, the most significant optical phenomenon initially occurred over the southwestern United States on March 13, 1997. Called the Phoenix Lights, this unexplained atmospheric anomaly lasted for three hours and was witnessed by thousands of people in the sky over the Arizona, Nevada and Mexico. Unlike most unusual sightings, follow-up research and investigation have resulted in no plausible explanation. It might have been a top secret military weapon, its existence too classified to reveal. Or it could have been the most dramatic UFO sighting in history. What did the citizens of Phoenix see that was so eerie and troubling? This mesmerizing television program presents amazing new footage of the Phoenix Lights that, a decade later, continue to appear periodically over the skies of Valley of the Sun in central Arizona.