The Underwoods tackle two threats that could bring their plans to ruin. Francis grooms his replacement as Whip. Claire goes on the offensive.

Amid turmoil in the home, Frank takes office. Foreign relations become entangled as Durant's team bungles a meeting. As foes negotiate to thwart her, Jackie maneuvers to strengthen her position. Lucas acquires new skills in order to pursue his secret investigation.

Tension rises between Francis and Raymond Tusk as the situation with China deteriorates. A battle in the Senate pits Francis against the Republicans.

A terror scare at the Capitol traps Francis with a resentful Donald Blythe. Claire gives a live interview that rocks the media.

Francis back-channels with a Chinese billionaire. Lucas uses extreme measures to expose the Vice President. A shadowy figure joins Team Underwood.

Amidst an energy crisis, Francis and Tusk end their shaky alliance. Lucas must make a difficult choice. Stamper grows closer to Rachel.

Despite some friction, the Walkers deepen their friendship with the Underwoods. But it's all-out war between Francis and Tusk.

The war with Tusk intensifies. Claire influences Tricia Walker politically and domestically. Francis has a show-down with Linda Vasquez.

Things get personal when Tusk blindsides the Underwoods with a scandal. Freddy and his BBQ joint get caught up in the mix.

With a military stand-off overseas and potential violence at home, Francis wants to finish off Tusk for good. Claire and Jackie Sharp collide.

A Special Prosecutor interrogates Francis. Remy Danton tries to keep his options open. Stamper wrestles with his demons.

Francis finds himself shut out and Claire makes a difficult sacrifice. Stamper tries to regain control.