when mafia came out some years ago it was fresh and an awesomely perfected game with cinematic narrative.
I was browsing around game sites and saw a game known as "the saboteur" i bought it and i am really enjoying it.
The story is funny and intriguing and it plays just like mafia.
I am around 2 hours in and really enjoying it.
Not to sure if a demo is available but its one i would recommend at least so far :D