A character from an earlier book in the series (Vol 3: Mother Russia), a bloodless Russian General accused of atrocious war crimes, is back with the aim of killing Frank Castle. How better to bait him than on the killing grounds of the notoriously unconquerable Afghanistan?
Throw in another character who is killing men who raped her earlier in the series, and one helluva bomb, and you've got Vol 7 in the legendary Punisher Max series.
The story is military heavy as Frank receives help from the Brits and takes down the Ruskies, but it's still the same Frank who walks the streets of American cities taking out gangsters. It's similar to "Punisher: Born" in that regard, except the jungles of Vietnam are substituted with the unforgiving mountains and deserts of Afghanistan as Frank and the Russian General play cat and mouse through this stark scenery.
"Man of Stone" is as dark a story as Garth Ennis has ever told and an excellent continuation of this fantastic series. If you're a fan, you'll love it.