A low-level Cabinet member becomes President of the United States after a catastrophic attack kills everyone above him in the Presidential line of succession.

Hours after the attack on the Capitol, President Kirkman steps into his role as Commander-in-Chief in the midst of chaos and confusion.

Tom juggles dealing with a security breach and preparing for his first television interview as the FBI continues to investigate the Capitol bombing.

After realizing that diplomacy isn't going to work with Algeria, President Kirkman decides the send the Navy SEALs on a mission; the probe into the Capitol bombing continues.

A shooting at the White House during a Governors' Summit throws President Kirkman's plans to elect a new Congress into turmoil. Hannah makes a shocking discovery in her investigation of the capitol bombing.

An American track-and-field coach's trip to Russia forces Kirkman into a hostage exchange involving the CIA and the Russian government; Agent Wells and Deputy Director Atwood's investigation uncovers dangerous information.

President Kirkman fears there could be a traitor in the White House when he discovers shocking information connected to the Capitol Bombing. Confiding in Emily, Kirkman puts her in charge of quietly investigating.

The nation reels from the aftermath of the shooting; Emily struggles with the knowledge there may be a traitor in the White House; Wells wrestles with her decision to reveal what she knows about the conspiracy.

Circles must tighten as a new discovery within the conspiracy emerges. Meanwhile, tension rises between Aaron and Emily as suspicions loom in the White House. Finally, a new lead places Agent Wells closer than before to the truth.

An investigative journalist shocks the White House when he reveals classified information during a press briefing; Hannah discovers a connection between MacLeish and the conspiracy.

President Kirkman forms an unlikely alliance in the hopes of passing his first bill while Agent Ritter is briefed by FBI Agent Hannah Wells about a new alarming threat to the nation.

President Kirkman's first international summit is derailed when journalist Abe Leonard publishes an explosive article. Meanwhile, Hannah Wells uncovers the conspiracy's next target.

Hannah Wells must stop the conspiracy from carrying out a final attack while President Kirkman authorizes a nationwide manhunt for the mastermind behind it all.