3 ideas
In 1959 Maciej Słomczyński, a Polish translator of Joyce, published a classic English country-house murder mystery under the English pseudonym Joe Alex. The book was set in an England imagined from inside communist Poland, written for readers who could not travel there, and it became beloved in Poland and Russia while remaining untranslated into English.
The country-house whodunit's setting is built mostly from literary conventions, such as the manor, the closed circle of guests, the Scotland Yard ally and class manners, rather than from observed geography. That makes the form reproducible by someone who has only read about the place. An 'England' can be assembled from the genre itself and still satisfy readers, because they judge it against the same conventions rather than against the real country.
Isolating a fixed set of suspects in one house turns a killing into a bounded puzzle that can be solved by elimination. The detective's closing reconstruction, promised in the title 'I'll tell you how he died', must use only facts already shown to the reader. The solution's authority therefore comes from reasoning over shared evidence rather than from hidden information.