The Diplomat returned for a fourth series with Kate Wyler staring at a crisis that could tip from espionage into war. The Russian submarine is still on the fritz at the bottom of the North Sea, the Americans have taken its nuclear missile, and Nicol Trowbridge still does not know it is gone.
That is why people are searching for The Diplomat Caste now. The new run turns the show’s familiar strain of diplomatic panic into something even more dangerous: a missing apocalypse weapon, a Kremlin that may notice too late, and a United Kingdom that could be on the receiving end when it does. Kate, played by Keri Russell, says Russia will come to get their sub, then warns that they will lose their shit when they find the weapon missing and attack the United Kingdom.
The setup works because the series has always treated official calm as a thin coat of paint over disaster. Here, the paint is barely dry. Grace Penn is the US president, Hal is the current US vice president, and Kate is trying to keep both sides from stumbling into a catastrophe while the missile sits out of Russian hands and Russia and the United Kingdom drift closer to confrontation.
The sharpest conflict is not the submarine itself but what the White House and London are still not being told. After protesters bunged up the M25, Kate and Hal end up at Windsor Castle, where the Penns and Wylers arrive at the currently king-free royal estate. Kate wants Hal to tell the president to tell the prime minister that the Americans have taken the Russians’ weapon. In her view, that would cauterise the fucking mess. Hal will not do it. He answers with a reluctant “Hmm,” then “Mmm,” and says he is not endorsing her confessional because it is dumb.
That refusal matters because secrecy is what makes the situation unstable. Kate is already jealous of Hal’s increasingly close relationship with Grace, and of the way his job lets him swank around doing clever-clogs global stuff while she is left stuck in drizzly London. She is also jealous of Grace, Todd and Callum Ellis, which makes every conversation at Windsor Castle feel less like strategy and more like a marriage being dragged through a state crisis. Even Grace’s imagined dinner manners — she would have mistaken the royal corgis for sheep and tried to have them served on rye — land as another sign that this circle is all appetite, no restraint.
The question now is not whether The Diplomat has raised the stakes. It has. The question is whether Hal will finally tell the president to tell the prime minister, because if he does not, the missing missile stays hidden only until Russia notices, and then the whole thing stops being a secret and starts becoming a war.
