If You Love Me, Say It: The Sequel

Looking for a Calm, Efficient Character Who Takes Enemies Down Behind the Scenes: No Fighting or Trash Talk, Any Genre

I'm so tired of stories where people just run their mouths, slap each other, and argue with fools. I want to see someone quietly strike from the shadows: knocking people out from behind, spreading rumors, poisoning, assassination, anything goes. I'm sick of all the verbal sparring. No conquest stories. Fantasy, horror, or crossover novels based on films and TV are all fine.