The Line Moves… Kate Wyler returns — and this time, the danger may be coming from inside the White House. Keri Russell is pulled into an explosive new crisis as Grace Penn and Hal Wyler become entangled in a conspiracy involving Russia’s most powerful weapon, while Kate’s already fragile marriage threatens to collapse. With Allison Janney, Rufus Sewell and Bradley Whitford at the center of the chaos, Season 4 looks darker, more personal and dangerously unpredictable. It feels like diplomacy, marriage and power are all heading toward the same breaking point.