Osama bin Laden's death gets a full reconstruction here, moving between the White House situation room in Washington, D.C. and the walled compound in Abbottabad, Pakistan, where he had hidden for years. ABC News correspondents Chris Cuomo, Elizabeth Vargas, and Chris Connelly report from New York, Martha Raddatz covers the decision-making in Washington, and Nick Schifrin reports from Pakistan, piecing together what is billed as a definitive account of the raid. The program includes video shot inside the compound after the operation, interviews with people connected to the mission, and a segment on the elite Navy SEAL team that carried it out, including how its members were selected and trained. A separate thread looks at teenagers who have no memory of a world before 9/11, and at how Hollywood dramatizations have shaped public assumptions about what actually happened that night. This is the first of three parts, focused on setting up the two cities, the two chains of command, and the raid everyone is about to watch converge on.