Noir-ish Sci Fi Alternate New York

Two battling superheroes fight and one of their energy blasts opens a rift into an alternate universe – “Empire State”; A mysterious fog shrouded parallel universe New York City, tied up in an endless war.   Think “noir”,  “steampunk”,  “Gotham” during a parallel “Depression Era Prohibition” with time travel, superheroes and gangsters.  Add private detectives, robots and rocket boots.  “Empire State” Private Detective Rad Bradley has been hired to investigate the disappearance of  a woman.  While doing this, he encounters visitors from “New York”. As his investigation continues, the truth behind the existence of “Empire State” unravels and causes the detective to start to question reality.   There is a lot going on in this book, can be a bit confusing, but it’s certainly an interesting read.