Vengeance: capital city ground zero

From the publisher

Sam Harper believes that he is living the good life. He has a decent job, a girlfriend and a four legged pal called Shadow. At nineteen he doesn’t think he could get it much better than this.
But things are about to throw his world into turmoil when his troubled past catches up with him. Now he has to fight to get back his girlfriend and his good life by revisiting a past that he thought he had left far behind him.