When investigators get close to uncovering the plot to kill the president, Duncan is ordered to take out an insider.

Brian wants to expose Duncan to the police, but changes his mind when he sees evidence of Ellen and Duncan getting close.

Ellen tries to make a deal with Duncan; Nina flees from the hospital after learning Duncan's plan.

After Duncan discovers Sandrine's betrayal, he decides to use her to save Nina and Sawyer. Also, just before Ellen is to operate on the President, the First Lady confronts her and forces Ellen to tell the truth about the assassination plot.