this storyline started out okay but it increasingly made less and less sense as it went on.  I appreciate the effort but its really just comes across as random idea's thrown together and called a 4 part story.

Does it seem bizarre that Karen accepts Jordan's death and his body being taken over by her friend?

After all four parts:

Ok, I tend to see the worst case scenarios.  Andrew's action following Jason's death seems pretty selfish to me, and Karen's acceptance rather bizzare.  You write that he was Karen's friend, not Jason's.  He ends up getting the girl.  Did he maybe want to be more than a friend and siezed an opportunity?  Wouldn't Karen think the whole idea of a persopn who was just a friend taking over her dead boyfriend's body to become her lover rather sick?  Could this all perhaps have been a conspiracy between Andrew and Karen.  She loved him but he was ugly; Jason was unloved but handsome.  etc.  etc.  True love betrayed  

It's not paranoia when they really ARE out to get you.

I really liked the atmosphere you created of a deteriorating environment, everything crumbling around them all.  What led me to my worst case scenario was that perhaps this was caused by all pervasive evil.  Even Jason's true love could not withstand it