When a teenage sex worker disappears, Rollins and Velasco find a key clue in a pile of neglected missing persons reports.
Elizabeth tries to track down those responsible for the White House attack, and finds out they had support from overseas; Henry comes face to face with one of the attackers.
The task force is led to an unusual suspect when the clients of an escort service start turning up dead; Red and a friend try to recover an item after reuniting at a friend's memorial; Cooper heads to Atlanta to follow a lead on his blackmailer.