A possible concise summary is:
The origin is a prequel to the Kingsman saga that tells the story of how Orlando Oxford, a British aristocrat and spy, founded the independent intelligence agency after World War I. Along with his son Conrad and his allies, he tries to stop a secret organization led by the Shepherd, who wants to start a global conflict by manipulating the three cousins who rule Germany, Russia and England. Oxford also faces Rasputin, a mystic who influences the Tsar to abandon the war. After losing his son in the battlefield, Oxford manages to expose the Shepherd's plot and get the United States to join the war. He then establishes the Kingsman agency with his code name Arthur and assigns other names to his partners. In a post-credits scene, the Shepherd's successor recruits a young Adolf Hitler.
Here are the key facts from the text:
1. Klinsmann is a prequel to two existing films.
2. The film begins in South Africa, 1902.
3. Duke Orlando Oxford, a Red Cross representative, is introduced.
4. Orlando's wife, Emily, and son, Conrad, sponsor the Red Cross.
5. Emily is shot and dies asking Orlando to protect Conrad from war.
6. Conrad grows up and pilots a plane with his father.
7. Orlando meets with General Kitchener about political dangers.
8. Rasputin joins a criminal organization aiming to start a world war.
9. Conrad switches places with another soldier to go to war.
10. Oxford becomes an alcoholic after Conrad's death.
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