From the campaign:
Nightcrawl is a film noir tabletop role-playing game. While quite the mouthful if you're familiar with the terminology it describes the essence of this project. Nightcrawl started as a one shot played among me and some friends, and now I'd like to give it a proper rulebook and bring the fun we had to everyone else!
Set in a big city of your choice from an alternate timeline Nightcrawl is a system that will allow you and any number of friends to play out a detective drama with gripping action, stormy weather, and smooth jazz from the comfort of your home.
From busting insidious mafia crime rings to tracking down the murderer of a famous actress, with Nightcrawl you will be able to run an in-depth and adaptive film noir movie of your very own. If you've ever wanted to wear a duster coat and trilby while you chase down a perp through a dark alley as rain pelts you, firing off sporadic shots from your snubnose revolver in an attempt to stop him, Nightcrawl is the system for you.
What if you want to use a tommy gun instead of a snubnose revolver? Don't worry, Nightcrawl will include a large table of weapons, implements, and other devices to use at your disposal. And if you can't find what you want in these reference tables guidelines will be provided to the DM and players on how to make your own.
There are a lot of big questions that come with this kind of setting, such as what is in the news currently? Are there telephones yet? Is prohibition still in effect? Thankfully due to how Nightcrawl is setup none of these are defacto, and just how many details the DM decides to gloss over in order to make life easier for the players doesn't effect the flow of the game! Unless of course you want it to.