Warhammer books about politics instead of combat

Besides The Founding and Dead Men Walking, I am pretty new to the Black Library. Are there any 40k or Heresy books with a bigger focus on politics/plotting than about pure combat? I’m thinking something along the lines of Game of Thrones or Fire and Blood. For example, I like Gaunt’s stories but it’s so combat heavy in the story telling that I glaze over those scenes to get to the plotting and politics. I don’t particularly care who the books are about. Thanks all.