I love this book. It ties up one long running vendetta from the Punisher's past: Saracen, the man who killed Frank Castle's last-living relatives.
That aside, there is one story detail that needs highlighting. The back story to Frank's trip to the "Empty Quarter" involves a reference to "Cold Steel," a story said to be upcoming in the pages of Punisher: War Zone.
Well, this story was never published. In fact, not long after Empty Quarter's release, all of the Punisher monthly series were canceled due to poor sales.
Luckily, Empty Quarter gives us some hints as to the plot, saying that it entails the Punisher targeting a Chicago-based gun-running operation, which leads to Reno, Navada, and climaxes with a big ol' gun battle.
It's highly doubtful that this story will ever see the light of day. But for those of us with easily distracted minds, us daydreamers, we can at least imagine the possibilities.