Series of games Mafia always contains in self a good plot. And how you can see from reviews on Steam, Mafia III also has a good story. Recently some players found a particular thing that has connections with plot. In game directory you may find a file called post_processes.xml. This file contains in self a serious spoilers for story in game. So if you don’t want to ruin your game experience, never open file post_processes.xml in Mafia III!