This is the concluding entry of Robert Ferrigno's "Assassin" trilogy. To recap the scenario: the USA has disintegrated. A horrific dirty-nuke attack against major cities precipitated a civil war, resulting in the "Islamic Republic" in the North and West, the "Bible Belt" in the South, and a few other enclaves (Here's a map.)
Things are rapidly going downhill for the fractured nation. Fundamentalists condemn people to death for the slightest infraction of their hyper-sharianism. Much of the country is an anarchic mess, where life is even cheaper. The Aztlán Empire (née Mexico) is aggressing from the South. The evil mastermind behind the original attacks is still around, and has intentions of establishing a worldwide caliphate, not caring overmuch how much more mass murder he needs to engineer. He has vast riches, and an array of ruthless and resourceful henchpersons.
That leaves things looking pretty grim for our hero, Rakkim Epps. He's barely survived the first two installments in the series, but (fortunately) he's become an even more deadly killing machine. His task here is set for him by his lovely wife, Sarah: could he go to still-radioactive Washington D. C., in search of a valuable—one might even say sacred—artifact, hidden away in an abandoned secret bunker? Even for Rakkim, this is slightly more dangerous than running down to the 7-11 for a pint of Cherry Garcia.
This installment has the usual imaginative violence, suspense, and a sharply rendered array of colorful characters. Ferrigno plays things pretty straight, but (without spoiling things too much) when the Aztlan Empire decides to bomb a particular cultural shrine in the Bible Belt, even I said: OK, that's a little over the top.