Purgatory (слэш)

“But I knew that, somewhere in his past, there was something he would do anything to undo, would spill blood to erase.  It was from that dark place he drew his resolve, his strength.”  Storm Front, Jim Butcher
Trapped in a desperate situation, Harry is forced to ask none other than Gentleman Johnny Marcone for help.  
In exchange, Marcone asks Harry to achieve the impossible.
Complete.