Based on the Noh drama with the same name, The Iron Crown is about a woman plotting revenge against her husband who leaves her for a younger woman. Shindo's adaptation juxtaposes the Noh drama with a modern update of the story. The husband is now a car salesman, the young woman a typist. The wife gets her revenge by harassing the couple with unwanted phone calls at night.
Elderly and a virtual prisoner in her own home due to her concerned staff and daughter Carol, Margaret Thatcher, Britain's first woman prime minister, looks back on her life as she clears out her late husband Denis's clothes for the Oxfam shop. Denis is seen as being her rock as she first enters parliament and then runs for the leadership of the Conservative Party, culminating in her eventual premiereship. Now his ghost joins her to comment on her successes and failures, sometimes to her annoyance, generally to her comfort until ultimately, as the clothes are sent to the charity shop, Denis departs from Margaret's life forever.
A strange man known only as the "metal fetishist", who seems to have an insane compulsion to stick scrap metal into his body, is hit and possibly killed by a Japanese "salaryman", out for a drive with his girlfriend. The salaryman then notices that he is being slowly overtaken by some kind of disease that is turning his body into scrap metal, and that his nemesis is not in fact dead but is somehow masterminding and guiding his rage and frustration-fueled transformation.
Captain Vinka Kovelenko defects from Russia, but not for political reasons. She defects because she feels discriminated against as a woman. Captain Chuck Lockwood gets the order to show her the bright side of capitalism, while she tries to convince him of the superority of communism. Naturaly, they fall in love, but there's still the KGB, which doesn't like the idea of having a defected Russian officer running around in London.