Elizabeth, Henry, and Isabelle investigate a plane crash that killed former Secretary of State Vincent Marsh. Nadine reenters the dating scene after she agrees to go on a date with a NASA scientist.

Elizabeth, to her surprise, is met resistance when she travels to Myanmar to sign a Pacific Rim trade agreement, which will modernize the country's power grid and benefit several of its trading partners. Meanwhile, Nadine attempts to mend her relationship with her estranged son.

As President Dalton eagerly awaits voting results on Election Day, Elizabeth uncovers information that could put the U.S.’s peace deal with Iran in jeopardy.

When a computer sting uncovers the possible mole in the CIA arms smuggling ring, Elizabeth’s questioning of the suspect makes her think that a larger, more dangerous force is behind the operation. Also, Henry worries that the doomsday cult is drugging his embedded operative, and Elizabeth and her State Department staff come up with an unorthodox approach to solving black rhino poaching in Namibia.

Henry teams up with a Marine veteran to fight for legislation that helps Veterans Affairs provide better mental health care, but he encounters surprising resistance from Vice President Carlos Morejon. Also, Senator Hanson questions Daisy about an arrest in her past.

When evidence implicates Daisy in the leak of hacked information during the presidential campaign and threatens to topple Elizabeth’s presidency, Elizabeth must decide what to believe and how far she’s willing to go to uncover the truth. Also, Henry and Elizabeth host former President Dalton at the White House after his interview with Bob Schieffer.