It's Christmas Day and President Kirkman is alerted to a group of religious extremists who refuse to evacuate when a forest fire threatens to engulf their cabin. Deploying Emily and Aaron to help diffuse the situation, Kirkman must act quickly to save multiple lives at stake. Meanwhile, the First Lady finally gives her testimony to the FBI director, while what happens next changes the lives of the Kirkman family forever.
On the night of the State of the Union, an explosion claims the lives of the President and all members of the Cabinet except for Secretary of Housing and Urban Development Tom Kirkman, who had been named the Designated Survivor. Kirkman is immediately sworn in as President, unaware that the attack is only the beginning of what is to come.