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The Diplomat Season 4 is officially confirmed!
Netflix's Emmy-nominated political thriller series finally returned with its third season on October 16, 2025. Keri Russell's Kate Wyler returned to her position as the US ambassador to the UK in the show's third outing, which was more tense than the past two seasons.
In addition to handling International affairs and political intrigue, Kate was torn between her duty as a politician and her role as Hal's wife, who was surprisingly nominated as the new Vice President by Grace Penn. Kate continued to confront Grace's motives as the US President and struggled to restore Nicol Trowbridge's faith in America after the HMS Courageous explosion.
That shocking The Diplomat Season 3 finale, where Hal betrayed Kate and sided with Grace, left many burning questions for the upcoming season.
The Diplomat Season 4 begins production this fall and should certainly answer these 5 burning questions.
5 questions that The Diplomat Season 4 must answer
How will Kate handle the fallout from Hal's betrayal?
In the final moments of The Diplomat Season 3, Kate finally realises that Grace Penn and Hal were in cahoots and they have used her to dupe Townbridge and steal Poseidon right under his nose. While Hal's new position as the VP was already a sore point for Kate, his betrayal will have a lasting effect on America's future.
While Townbridge is unaware of Hal and Penn's schemes, the UK is bound to learn this truth, following which it will be considered as an act of war on America's part. One of the major anticipation points for The Diplomat Season 4 is how Kate will handle Hal's betrayal and the messy politics between nations.
What will happen to Kate and Hal's future?
Hal made a reckless decision once again and betrayed his wife in The Diplomat Season 3. While he did not confirm Kate's accusation in the final moments of the show, his silence was the only confirmation Kate needed. Following Hal's selection as the VP, the couple had a falling out and were almost on the verge of a divorce.
While the physical distance kept them apart in Season 3, Kate's new affair with Callum Ellis threatened the foundations of their marriage. Kate was still ready to give their marriage another chance until she learned about Hal's betrayal. This leaves uncertainty about the couple's future in The Diplomat Season 4.
Will Callum Ellis return in The Diplomat Season 4?
Poldark fame Irish actor Aidan Turner debuted in The Diplomat in Season 3 as a British spy named Callum Ellis, who started a love affair with Kate. Callum was certainly a refreshing addition to the show, who helped Kate realize her feelings amidst her falling out with Hal.
While Kate decided to give her marriage to Hal a chance, Callum informed her about Poseidon in Season 3's final moments. With Kate standing at a crossroads of politics and emotions, it remains to be seen whether she will continue her relationship with Callum in The Diplomat Season 4.
What is America's future after Grace and Hal's actions?
A lot is riding on Grace and Hal's actions in The Diplomat Season 4. Since Townbridge is unaware that his American counterparts have betrayed him yet again, he will surely assume that Poseidon was stolen by the Russians.
However, the truth about Grace and Hal's actions is bound to come to light and the UK can even attack America in the aftermath. Since the US Navy entered the UK waters to 'take pictures' of Poseidon, this is directly an act of war, which gives them the right to attack America. The Diplomat will return with even more political intrigue and international tensions in Season 4.
Will Hal continue to side with Grace Penn?
The final moments of The Diplomat Season 3 saw Grace's husband, Todd, questioning his wife's budding relationship with her VP. He even extends his concern to Kate, who realizes that her husband and Grace are co-conspirators in Poseidon's theft.
The third season ended with Grace and Hal posing together for the cameras, and their closeness was evident. It remains to be seen what will become of Hal and Grace's relationship, and will Kate's husband will continue to stand against her in The Diplomat Season 4.
The Diplomat Season 3 is streaming on Netflix.
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