The fourth season of The Diplomat arrives on Netflix on October 15, and it is difficult to imagine how the series could possibly make its characters’ lives any more chaotic. But considering Kate and Hal Wyler’s track record, we know there is always room for things to get worse. After three seasons combining international crises, marital betrayals, political ambition, and decisions capable of triggering a war, Debora Cahn’s creation has reached a particularly interesting point: its protagonists’ personal conflicts have become a threat to global security. And, as we have learned, the people responsible for solving the problems are not always especially interested in preventing them.

The third-season finale left Kate Wyler (Keri Russell) facing a discovery that perfectly encapsulates the contradiction at the heart of the series. After persuading the British government to neutralize a powerful Russian nuclear weapon, she discovered that her husband, Hal (Rufus Sewell), now Vice President of the United States, had conspired with President Grace Penn (Allison Janney) to seize it. What should have been a diplomatic solution became yet another clandestine operation, with potentially catastrophic consequences. To make matters worse, Kate had just reconciled with Hal after an affair with Callum Ellis (Aidan Turner), believing that their marriage might still be saved.

Debora Cahn has described the new season as the story of two couples whose public responsibilities undermine their private relationships. The growing alliance between Hal and Grace will force Kate into an unlikely partnership with Todd Penn (Bradley Whitford), the president’s husband, while the trust between the United States and the United Kingdom threatens to collapse. As usual, the Wylers seem perfectly capable of turning any situation into an even greater disaster. Before the premiere, here are ten questions that need answering.

1. Is Hal Wyler a traitor, or does he genuinely believe he is saving the world?

This has always been one of the most interesting questions in The Diplomat, precisely because Hal is far from a conventional villain. Intelligent, seductive, manipulative, and absolutely convinced that he understands the political game better than everyone else, he tends to justify his decisions as necessary, even when they involve betraying the people closest to him. The theft of Poseidon, the Russian nuclear weapon that was supposed to remain inaccessible at the bottom of the sea, is the greatest example of that logic so far. Does Hal believe the United States must control the weapon to prevent a future catastrophe, or is he simply exercising the power he has always craved? The distinction matters, although he would probably consider both explanations perfectly compatible.

2. Can Kate and Hal’s marriage still survive?

There is something almost fascinating about this couple’s ability to destroy every possibility of stability. During the third season, Kate grew close to Callum Ellis and briefly experienced a relationship less dominated by the relentless competition that defines her marriage. Yet she chose to return to Hal, only to discover that he had made one of the most dangerous decisions of his career without consulting her. The problem is that their relationship has never depended entirely on love. They share a language, an intellectual intimacy, and an almost compulsive need to participate in each other’s decisions. Kate complains about her husband’s interference but frequently relies on his intelligence whenever she needs to solve a problem. Hal, meanwhile, seems incapable of respecting the boundaries she establishes. How long can this dynamic continue to pass for a partnership?

3. What is really happening between Hal and Grace Penn?

The growing closeness between Hal and the president may be more threatening than an extramarital affair. After all, these are two people who share ambition, political experience, and the conviction that certain decisions are far too important to depend on consensus. Grace does not try to control Hal the way Kate does. Instead, she seems to encourage his most dangerous instincts, while he has finally found someone willing to turn his ideas into action. Todd has already noticed the intensity of their relationship, but perhaps he is searching for a romantic betrayal when he should be worrying about something much greater. Is there an attraction between them? Possibly. But the real infidelity seems to be taking place through the exercise of power.

4. Can Kate confront the president without destroying her own career?

Kate has always presented herself as a professional capable of separating personal interests from diplomatic responsibilities, although the series has repeatedly demonstrated that the distinction is not nearly as simple as she would like to believe. She now knows that Grace Penn, responsible for the operation that killed 43 British service members aboard HMS Courageous, is involved in another international conspiracy. Exposing the theft of Poseidon would mean confronting the president of the United States and her own husband, who holds the vice presidency. Remaining silent, however, would make Kate complicit in an operation that could trigger a war. For perhaps the first time, she may have to choose between loyalty to her marriage, preserving her position, and defending the principles she claims to believe in.

5. Can Kate and Todd Penn form an alliance?

Bringing Kate and the First Gentleman together is one of the most intriguing choices announced for the fourth season. Both have been placed in remarkably similar positions: their respective spouses have developed a partnership that threatens their marriages as well as political stability. But sharing a problem does not necessarily mean wanting the same solution. Todd may be more interested in protecting Grace and preserving her presidency, while Kate needs to prevent an international crisis without destroying her own life. There is also an irresistible irony in this exchange of partners: after three seasons trying to manage a husband who refuses to follow the rules, Kate may finally meet someone who understands her frustration better than anyone else.

6. How will the United Kingdom react when it discovers the theft of Poseidon?

Prime Minister Nicol Trowbridge (Rory Kinnear) accepted Kate’s proposal to neutralize the Russian weapon without allowing any country to take possession of it. The decision was intended to prevent a crisis involving Moscow from escalating into an international confrontation. Unfortunately, Hal and Grace used the operation to do precisely the opposite. If the British discover that the Americans carried out a clandestine mission inside their territory and removed the weapon, trust between the two governments could suffer damage that would be extremely difficult to repair. And we should not forget that Trowbridge already has more than enough reasons to distrust Washington. How many betrayals can a historic alliance survive?

7. Will Callum Ellis still have an important role in Kate’s life?

Played by Aidan Turner, Callum emerged as a romantic alternative for Kate, but his importance extends far beyond their affair. Connected to British intelligence, he was also involved in the events that led to the discovery of Poseidon and revealed the scale of the threat. His relationship with Kate could become even more complicated if information about the American operation becomes public. After all, he represents both an emotional possibility she appears to have abandoned and a professional commitment to British interests. Kate chose Hal, but her choices rarely bring a story to a definitive conclusion. Will Callum be willing to remain close to her once he discovers just how deeply her husband is involved?

8. Will Austin Dennison and the embassy staff keep paying for the Wylers’ mistakes?

One of the most interesting aspects of The Diplomat is watching the professionals who struggle to keep diplomacy functioning while their superiors turn international decisions into personal battles. Austin Dennison (David Gyasi), Stuart Hayford (Ato Essandoh), and Eidra Park (Ali Ahn) represent different forms of commitment to institutions that are not always respected by the people running them. Dennison has already had to deal with both the political and emotional consequences of his closeness to Kate, while Stuart and Eidra know the Wylers well enough to understand that no crisis remains exclusively professional for very long. With Hal in the vice presidency and Grace involved in a clandestine operation, how much longer can their loyalty survive?

9. Can Grace Penn remain president?

Allison Janney has made Grace a fascinating character precisely because her authority seems to come from an absolute conviction that she knows what must be done. But the president is already responsible for an operation that cost dozens of British lives, and she is now participating in another initiative capable of provoking a confrontation with Russia. Billie Appiah’s (Nana Mensah) promotion to a more central role also suggests that the White House will become increasingly important this season. In the trailer, when Kate accuses the administration of crossing a line by conducting a secret military incursion into an ally’s territory, Billie replies that the line moves. It is a disturbing statement because it reveals how quickly exceptional decisions can become acceptable procedures. Grace believes she is protecting her country, but how long can that justification sustain her authority?

10. Will Kate Wyler finally learn something from her own mistakes?

Perhaps this is the most important question of all. Kate is presented as a brilliant, capable diplomat, frequently forced to repair the consequences of decisions made by ambitious men. Yet her story reveals a far more contradictory character. She demands transparency while withholding information; condemns Hal’s manipulation while employing strategies of her own; complains about her husband’s interference while constantly depending on him. There is a difference between being a woman surrounded by dangerous politicians and recognizing one’s own contribution to the problems they create. Could the fourth season finally force Kate to confront that responsibility, rather than allowing her to continue playing the outraged victim of everyone else’s decisions?

The Diplomat has never really been a series about the serenity of international negotiations. Its strength lies in the way it transforms political ambitions into personal conflicts and vice versa, creating a kind of geopolitical soap opera in which nobody is entirely innocent. Bringing Bradley Whitford into the center of the story alongside Allison Janney also provides a particularly entertaining reunion for anyone who followed The West Wing, although Aaron Sorkin’s idealism could hardly be further removed from Debora Cahn’s moral universe.

The fourth season’s greatest challenge will be to deliver consequences worthy of its protagonists’ choices. After so many lies, reconciliations, and conspiracies, simply placing Kate in another crisis and allowing her to solve it through some combination of outrage, improvisation, and arrogance will no longer be enough. A nuclear weapon has disappeared, a president is prepared to cross dangerous boundaries, and a vice president seems to regard every obstacle as another opportunity to demonstrate his intelligence. If Kate genuinely intends to prevent a war, perhaps she should begin by accepting that she, too, is part of the problem.