This clip re-enacts the attacks of September 11, 2001. One of the flights vanishes off the radar, and air traffic control tries to communicate with it. As news starts pouring in of an attack on the World Trade Center, concerned air traffic controllers note that the flight is heading towards Washington D.C. and begin to suspect the worst.

Giuliani describes his experience living through the 10 seconds in which the south tower caved in and fell to the ground. This clip contains real footage from September 11, 2001.

Photojournalist David Handschuh recalls his experience during the September 11, 2001 attacks. He was taking pictures near the South Tower when it collapsed, which hurled him half a block and shattered his leg. He describes his experience being rescued.

Gabby and Tina create a casebook with a list of suspects and evidence to deduce the real arsonist.

Lieutanant McQuade explains the act of arson and their list of clues during his interview with Gabby and Tina.