As tensions between East and West Hanchu escalate, President Kirkman travels to Camp David to broker a peace treaty with the leaders of those countries; while back in Washington, D.C., Seth and Emily take a hard look at their relationship and decide how, and if, they will move forward as a couple.

President Kirkman and his staff have credible intelligence that a dirty bomb is on U.S. soil, thrusting the president into a high-stakes effort to find the bomb and stop it from detonating. At the White House, Emily approaches Chuck to help her with something that has damaging and illegal consequences.

Following the deadly bomb explosion inside a D.C. metro station, President Kirkman declares war on Kunami. When the emir of that country sends his ambassador to negotiate, FBI Agent Hannah Wells learns the emir is hiding something that could have deadly consequences.