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. Meanwhile, at the White House, Emily approaches Chuck to help her with something that has damaging and illegal consequences.

As more content from President Kirkman's confidential therapy sessions continues to leak out, Vice President Darby meets secretly with the entire Cabinet, resulting in attorney Ethan West looking into the president's past – while playing a large role in his future as commander in chief.