As the team tries to control fallout from damaging testimonies and leaks, everyone is under suspicion and tensions flare between Frank and Claire.
The next day, Hammerschmidt discovers leaked information: that the White House staged a terrorist attack on Election Day. Seth panics in his office while Frank discusses spying on all White House personnel to find out who the leak is.
Meanwhile, Claire tells Tom that she wants him to leave.
Doug is spying on all West Wing staffers, and is intrigued when LeAnn gets something unknown from Aidan. After confessing to Laura Moretti that he is the reason her husband died, Doug goes to LeAnn's apartment and the two have sex.
An article breaks the next day: that a source from within the White House confirmed that Frank used questionable intelligence to close voting centers on election day. Frank confronts Cathy about this, who is cooperating with Alex Romero.
Frank later states that he believes Cathy is the leak, and that he has held on to her resignation.
News breaks that Cathy will testify in front of the Declaration of War committee. Hammerschimdt is given a "birthday card" with a computer chip in it from an unknown source.