Paper Killer I am honestly very surprised, excited and disappointed. How come this game didn't get a sequel or next episode? I managed to play it and I think this game is fantastic. The story, the atmosphere, the implementation, the whole game alone gave something that no detective or mystery game has ever seen before. I just don't understand why the sequel wasn't made.
If we stay on the detective line, Raven Crime is also a very good and atmospheric game, but (in my opinion) it is far from Paper Killer. In addition, a special bonus point is that I felt like a detective myself, since I figured things out on my own, the game made me think, but the puzzles were not unsolvable and the atmosphere was amazing, I enjoyed that it was a real dangerous adventure and that I was investigating. For me, this is a podium place so far. I don't really believe in miracles, but if the next part of this game is ready, then it will be.
High School Detective 
Kaz: The Dork Knight 
Chains of Fate 
Geoffrey's Quest