The Diplomat Season 3 drops a shocking twist that keeps the drama going for next year. In the final episode, “Schrodinger’s Wife,” the show turns a familiar diplomatic play‑by‑play into a high‑stakes chess match.
The U.S. and U.K. find themselves knee‑deep in a cover‑up that involves a rogue Russian submarine and a weapon the show calls Poseidon—a nuclear‑powered drone that could wipe out the mainland UK if it were launched.
Keri Russell’s Kate Winslow and Rufus Sewell’s Hal Donnelly learn that Vice‑President Grace Penn (Allison Janney) was behind the attack on HMS Courageous. After a dramatic press conference that names the U.S. and former President Rayburn, the two governments meet to decide what to do with the threat.
Nichol Trowbridge (Rory Kinnear), the U.K. ambassador, goes to the negotiation table armed with evidence that the U.S. is already aware of the Russian sub. When the U.S. offers help, Trowbridge walks out, forcing Kate to rely on her British spy boyfriend Callum (Aidan Turner) to relay the danger to Trowbridge.
In a move that could be considered an “act of war,” the U.S. secretly sends a sub into British waters to capture footage of the sunken sub and the Poseidon drone. The photo evidence convinces Trowbridge that the weapon is real, but he still refuses U.S. aid. Kate proposes burying both the sub and the drone in concrete on the ocean floor to neutralize the risk, an idea Trowbridge considers but ultimately rejects.
The episode then shows Callum telling Kate that the Poseidon has vanished and may have fallen into Russian hands. The evidence points to Hal and Penn orchestrating the theft—a plot that could drag Russia and the U.K. into renewed conflict.
As the credits roll, Hal confronts Penn, warning that the U.S. may have stolen a doomsday weapon with the goal of blaming Russia.
With the season ending on this cliffhanger, viewers can expect a season 4 that will navigate the fallout: U.S.‑U.K. diplomatic repair, the hunt for the Poseidon, and the looming threat of nuclear escalation.
Netflix now streams The Diplomat Season 3. Subscribers can watch on the platform for $7.99 a month for standard with ads, or $24.99 for ad‑free, 4‑K UHD streaming on up to four screens. The series continues to pull followers into a world of espionage, political intrigue, and high‑stakes crises that keep the globe on edge.
Source: New York Post
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