Spoiler warning: This article discusses all eight episodes of “The Diplomat” Season 4.

“The Diplomat” has ended its fourth season by stripping away the certainty at the center of its story: Kate Wyler is no longer the U.S. ambassador to the United Kingdom.

In the finale, now streaming with the rest of Season 4 on Netflix, Kate publicly resigns during the G7 summit after reaching her limit with President Grace Penn’s increasingly aggressive geopolitical tactics involving Russia and the new U.K. prime minister.

Grace’s decision to send Stuart home after he registered his disapproval also contributes to the rupture. When Kate makes her exit, Billie and Miguel follow her out the door — but the episode still has one more major departure to reveal.

Kate turns back and discovers that her husband, Hal, has resigned as vice-president as well.

What Hal’s Resignation Means

The double resignation leaves Kate and Hal outside an administration they had both been attempting to influence, raising the question of whether Hal’s move was primarily an act of solidarity with Kate or another calculated political decision.

Rufus Sewell, who plays Hal, indicated that the answer is not limited to one motive. Speaking to TVLine, the actor said, “I think it’s a mixture of things.”

According to Sewell, Hal has been wrestling with the morality of his position while calculating that remaining close to Grace could give him a chance to affect events. That belief, however, runs into the possibility that his influence may ultimately amount to nothing.

Sewell acknowledged that Hal is “calculated” and suggested that Kate’s stand gives him the push he needs. “He needs that nudge,” the actor said, adding that “there’s a little bit of all of it in that decision.”

The result places the Wylers in a striking new position. Rather than attempting to shape the White House from within, both have now walked away from their official roles. Whether that makes them a united force against Grace remains unanswered.

Grace Faces Doubts Closer to Home

Kate and Hal are not the only people disturbed by Grace’s conduct. By the end of the season, even the president’s husband, Todd, appears alarmed by her aggressive and at times erratic approach.

Bradley Whitford, who plays Todd, said the finale suggests “a little bit of a temptation” for Todd to challenge Grace for her own sake. Yet he also described speaking up as “an impossible thing for him to do.”

Whitford remains interested in whether the characters — and viewers — may have been too protective when questioning Grace. He also raised an unresolved possibility that could significantly alter the meaning of her actions: Grace may be pursuing a much longer strategy than anyone around her realizes.

“I really have no idea at all,” Whitford said of that possibility.

ShowBiz Take

The finale’s biggest move is not simply that Kate quits. It is that the series has now put its central character’s professional identity into doubt while also removing Hal from his place inside Grace’s administration.

Those choices leave several parts of the drama unsettled at once: Kate’s employment, Hal’s political future, the Wylers’ relationship to the White House and the broader state of U.S. diplomacy. Todd’s hesitation adds another layer, because Grace could face resistance not only from the officials who have left her orbit but also from the person closest to her.

At the same time, the suggestion that Grace may be playing a “very long game” prevents the finale from offering a simple verdict on her judgment. Kate sees resignation as necessary, Hal ultimately joins her, and Todd is clearly uneasy — but the season stops before confirming whether Grace’s strategy is reckless, misunderstood or both.

What Happens Next?

Netflix has not formally renewed “The Diplomat” for Season 5, so the future created by the finale remains unconfirmed.

Showrunner Deborah Cahn is not providing answers yet, either. Asked where the story could go and whether Kate and Hal might be united against the White House, she replied: “You’re asking all the right questions, and if you could submit some answers to me in writing, I would appreciate it.”

For now, all eight Season 4 episodes are available on Netflix, ending with Kate and Hal out of office, Grace still in power and the show’s diplomatic landscape more uncertain than ever.