''The War Within'' is the story of Hassan, a Pakistani engineering student in Paris, who is apprehended by Central Intelligence Agency for suspected terrorism activities. After his interrogation, Hassan undergoes a radical transformation and embarks upon a terrorist mission, surreptitiously entering the United States to join a cell based in New York City. After they have meticulously planned an event of maximum devastation, the members of the cell are arrested, except for Hassan, Khalid, and their cell leader Izzy.