Alan Wake "The Writer" DLC

I haven't actually played Alan Wake, so excuse me if I'm kinda in the dark about the storyline.  Hehe, in the dark.  Get it?  Cause he runs around in the dark...with a flashlight...sorry.  

"The Writer" is the second piece of DLC for the Alan Wake series, continuing where "The Signal" left off.  Like I said, I don't really know much about it, but "The Writer" is supposed to tie together loose ends.  And apparently there's some crazy diver guy who helps you out.  Neato.  Check out the trailer and tell me, should I pick up a copy of this game?