An Exorcist Possessed

Eddie thinks he is safe. He thinks he has won.
But the devil has other plans.
There is a piece of something evil inside Eddie, and every day it grows stronger.
What do you do when the evil you are fighting doesn't come from your enemy, but from yourself?
Will Eddie be able to face this evil before his enemies find a way of bringing it out?
Because the answer to this question may not just determine his fate, but the fate of the world.