Amidst the unimaginable darkness of September 11th, quiet miracles of survival and grace still broke through the ash. One of the most remarkable stories of that morning unfolded inside the North Tower of the World Trade Center, where Welles Crowther, a twenty-four-year-old equities trader and former volunteer firefighter, made a choice that would echo into eternity. When the plane struck, Welles did not run for the safety of the street. Instead, he wrapped a red bandana around his face to fil...