Green_Hilltop: It's not Alan Wake, is it? For some reason that description me remember that game.
No, it isn't. :)
The setting of the game is quite fantastic, as the town I mentioned earlier has been abandoned by humans... but it's overridden with monsters.
The few remaining survivors want me to stay and help them fight the monsters, but I'm only interested in finding my old friend. My search doesn't last very long though, as I run into my friend quite early... only to find him transformed into a monster. :(
So I do the right thing and I kill him. And then, when my only reason for being there has ceased to be, I decide to stay and help to poor survivors.
(And that's all I can tell you about the plot, as I still haven't played the game past this point :P)