The White House grapples with the unfolding tragedy as Sterling (Zeljko Ivanek) continues the investigation into his primary suspect. Sophia (Laura Innes) manipulates the traitor inside the White House, confirming the suspicions of Chief of Staff Peel (guest star Roger Bart, "Desperate Housewives"). Leila (Sarah Roemer) and Michael (Scott Patterson) attempt to rescue Simon (Ian Anthony Dale), but at tremendous personal risk. Elsewhere, Sean (Jason Ritter) and Vicky (Taylor Cole) try to identify Sophia's secret courier before it's too late. Blair Underwood, Bill Smitrovich, and Lisa Vidal also star.