On September 11, 2001, terrorists attacked the World Trade Center in New York City. Many people were killed, and many were trapped under the collapsed buildings. When police officer James Symington heard about the attacks, he knew he and his German shepherd, Trakr, had to help. Follow Trakr's lead as he and Symington bravely search and dig through the rubble to help rescue survivors of one of the deadliest days in U.S. history.