Genres
Urban fantasy
Fantasy transplanted into a modern real-world city, with a protagonist who has a foot in both worlds.
Urban fantasy transplants fantasy into a modern real-world city. Its signature protagonist has "a foot in both worlds": street-savvy and magically capable, and the mode borrows freely from noir and police-procedural conventions. (First-person narration and hidden-magic setups are common but are not, per sourcing, defining requirements.)
The genre's continuity surface is the masquerade itself: who knows what about the hidden world, and since when, which is knowledge tracking with the stakes turned up.