Da en bombe dræber præsidenten og andre toppolitikere, må den stille minister Tom Kirkman pludselig stå i spidsen for en regering i kaos.

Dagen efter bombningen sætter præsident Kirkman guvernøren på plads, og en vordende sammensværgelse ser dagens lys. FBI begynder jagten på bombemændene.

Wells fremfører sin teori om bombningen, efter en militant gruppe tager ansvaret, og Kirkman får en smagsprøve på brutale politiske manøvrer.

Mens et angreb på Majid Nassar tager form, udfordres præsident Kirkman af forræderiske provokationer fra en guvernør og højtstående officerer.

Et kryptisk spor om Capitol fører Wells til en chokerende opdagelse, og Kirkman kæmper med beslutningen om et risikabelt angreb på Majid Nassar.

Mens Kirkman forsøger at få nogle skeptiske delstatsguvernører over på sin side, forsøger Wells og Atwood at tvinge sandheden om bombeangrebet ud af Majid Nassar.

Atwoods mistanke til MacLeish er en farlig balancegang, og en amerikansk helt, som arresteres i Rusland, udløser en international spionagekrise.

En ny terrorhandling truer landets nye valg, Kirkman står over for et opgør med Leo, og Atwood kommer med en smertelig bekendelse.

Wells' undersøgelser giver fældende beviser mod en højt placeret embedsmand, og en NSA-whistleblower fører Kirkman på sporet af en skræmmende afsløring.

Kirkman mistænker, at der er en muldvarp i deres midte og beder Emily tage affære. Wells jagter den ukendte meddeler og opdager en ny skæbnesvanger trussel.

The nation reels from the aftermath of the shooting on the steps of the Capitol while Emily struggles with the knowledge there may be a traitor in the White House. Agent Wells grapples with her decision to reveal what she knows about the conspiracy behind the Capitol bombing.

Circles must tighten as a new discovery within the conspiracy emerges. Tension rises between Aaron and Emily as suspicions loom in the White House. 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 and leaves Seth struggling to contain the damage from the leaked story. Hannah unearths a key connection between MacLeish and the conspiracy.

Turmoil in an African country forces President Kirkman to rely on an unlikely ally for help. Hannah's investigation into the Capitol bombing takes an unexpected turn. Emily settles into her role as chief of staff. Aaron has to make a difficult choice.

As President Kirkman releases an agenda to reset his presidency, Alex makes a controversial public statement that threatens to derail it. Agent Wells unknowingly finds herself in the center of a dangerous trap while getting closer to the truth.

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

As President Kirkman struggles to put together a new Supreme Court, FBI Agent Hannah Wells goes undercover and discovers much more than she ever could have imagined. Seth Wright has to contend with journalist Abe Leonard, who returns from the Middle East with an explosive story.

As President Kirkman considers candidates for Vice President, Kimble Hookstraten finds herself embroiled in scandal. Agent Wells and Jason Atwood return from North Dakota with a critical new lead while journalist Abe Leonard's investigation takes an unexpected turn.

As the White House gears up for President Kirkman’s first international summit, Kimble Hookstraten faces her toughest political battle yet when her speakership is challenged. Meanwhile, Alex wrestles with whether or not to bring the kids back to Washington.

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.

In the nail-biting season finale, 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.