"Weird fiction" author China Miéville wrote an interesting detective novel, "The City & the City", about two cities that occupy the same geographical space and

"Weird fiction" author China Miéville wrote an interesting detective novel, "The City & the City", about two cities that occupy the same geographical space and the implications that has for daily life and government operations: https://en.wikipedia.org/wiki/The_City_%26_the_City https://en.wikipedia.org/wiki/The_City_%26_the_City