So much was lost on September 11, 2001. On that morning, the World Trade Center was a veritable mini-city, bustling with activity, with over 14,000 people beginning their workday in offices, or otherwise on the job, as they had so many days before. The human loss is made clear in this stunning feat of reportage that reconstructs the events of that morning from testimony from those who made it out, and also from the amazing, and heart breaking, messages in emails and phone calls from those who did not. Just what took place inside the Twin Towers that day? And why did so many die? The focus here is on the workers, visitors, and first-responders whose stories are told by two New York newspapermen in a narrative that brings order to the chaos caused by terror.