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

Frank puts China in the cross-hairs. Claire confronts a painful trauma from her past. Lucas Goodwin presses for the truth.

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

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

Frank 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, Frank 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 Frank and Tusk.

The war with Tusk intensifies. Claire influences Tricia Walker politically and domestically. Frank 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, Frank wants to finish off Tusk for good. Claire and Jackie Sharp collide.

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

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

Frank faces annihilation while the nation is in an uproar. Stamper must tie up loose ends. Claire feels the cost of ruthlessness.