Ted Dekker is an imaginative author who always keeps you guessing in his stories. My favorite was Three. I generally won't pay full price for his books, because I never know if I will 'get' them or not. So, when I saw this short story offered for free, I thought I'd give it a shot.
The tale begins with two monks, actually biological brothers, who are living as hermits in the wilderness. They are approached by a stranger who shares a secret with them: They are dead men, and he soon will be, too, because of a genetically-engineered virus designed to rob them of all emotion except one. He claims to have the cure, and offers the monks a taste of what life could be like without this disease. The monks are skeptical, but one tries the remedy and experiences a moment of truth he would not have imagined.
Although I have not read the rest of the series, and don't think I will, I can guess what the allegory is. The virus is sin. Fear has enslaved us. The blood of Jesus is the cure.
If you want to know the backstory of Forbidden, the first book in the series, The Book of Mortals, then you can get this for free on your Amazon Kindle. Ted Dekker fans will no doubt appreciate it. It's an easy read that you can knock out in about 10 minutes--like at the doctor's office or on a commuter train.