 Stacey and Mark are drawn into the holy community at Ground Zero. As Mark later tells CBS, "I ve shot plenty of disasters -- but there s something very different about this one." He explains that there s a deep level of respect beyond the yellow tape, almost as if it were a wake. "By their mere presence,  Mark tells Dan Rather,   these firefighters, rescuers and law enforcement officers have transformed profound evil into holiness." Based on real events and a real couple, the story of Mark and Stacey Grego becomes particularly poignant when looking back to that day four years ago that changed America forever. This two-person video team, with expertise in training firefighters and first responders, were called upon to document the tragedy through the eyes of the fire-fighters and rescue teams. During their tour of duty at Ground Zero, Stacey and Mark Greggo learn that determin-ation and resolve energized thousands of rescuers during the dig. They worked tirelessly to accomplish the unspoken goal. Unrealistic? Maybe. Without merit? "NEVER!" Stacey says. "Each and every life that was lost, was not and shall never be in vain."