Il Mondo di Eymerich
Players take the role of medieval investigators, pursuing strange, eerie events to discover and - maybe - change our present world.
The game put the players in the world depicted by the novels of Valerio Evangelisti, rooted in medieval history, but full of strange events. The core book describes the ancient setting (the supplements add the future history part). Mechanics are simple, but with an optional, very detailed combat system (the author is a fencing master), and they allow narrative intervention by the players.