The City and Its Uncertain Walls has an intriguing concept, I don’t think it is too original but once you get into it the narrative starts making sense
Breach by W.L. Goodwater is a novel taking place in the aftermath of World War II, where the remaining powers fight with magic as well as conventional means.
Mr. Gaiman is a master of the modern fairytale, abstractly manipulating physics and using legends as histories (“It all depends on how you look at it”)