Dr. Donald Ellis lost everything on 9/11. He lost his wife and daughter in the south tower of the World Trade Center. But while others grieved, or plotted revenge, Dr. Ellis threw himself into a long-dormant research project. He traded his lab at the University of New York for an ugly riverfront warehouse in Brooklyn. What is he working on? And why does he spend every free moment at the warehouse standing by the river, staring across the water at Ground Zero? Because Dr. Ellis has a plan: he's going to make 9/11 "unhappen."