Necromunda: Underhive Wars is set in the Warhammer 40k universe, where people live in humongous hive cities. It's a game about gang warfare on the subterranean levels of the city (basically, the higher you are in the city, the higher is your standard of living and below ground is pretty crappy).
It's a tactical RPG game focusing on this gang warfare. You lead your gang on missions, gather loot, level up and equip your gangers, gain territory etc.
As far as I've seen it's a pretty good representation of it's tabletop origins. Haven't played it much yet but it looks pretty good, the story (in the story mode) is engaging and I generally like it for what it is. My only concerns are that the UI is not the greatest (takes some getting used to, typical for cross-platform titles) and currently there are only 3 gangs available (Escher, Goliath and Orlock) out of 12+ in the TT.
If you like this kind of thing it's definitely worth checking out.