It was the deadliest building fire in United States history, twice as deadly as the fire which tore through the city three decades earlier. Chicago thought it had seen the worst that fire could do, but then came the afternoon of December 30, 1903. The Iroquois Theater was filled and then some - with children on Christmas break and their parents, with teachers enjoying their own time off, with college students wishing to enjoy a show with their friends. "Mr. Bluebeard" was supposed to be a spectacle, and it was - a terrifying one.