"On September 11, 2001, an entire country ground to a halt as terrorists attacked the World Trade Center in New York City, the U.S. Pentagon in Washington D.C., and crashed an airliner near Shanksville, Pennsylvania. Now readers can step back in time to learn what led up to the 9/11 terrorist attacks, how the tragic events unfolded, and the ways in which one devastating day changed America forever."--Provided by publisher.

Introduction -- A Tuesday morning -- Two more planes -- Inside the buildings -- A changed world.