The Reflecting Pool: The Marko Zorn Series, Book 1 (Unabridged‪)‬

Murder leads to the White House 

Marko Zorn, a Washington, DC, homicide detective with expensive tastes in art, classic cars, and women, must take on extra work - not always strictly legal, often unorthodox, and usually dangerous - to supplement his income - work which requires his special combination of skill and steel nerves. Although he's skilled at navigating the corridors of law enforcement and the hideouts of criminal gangs, he'd prefer to stay home and watch old movies, enjoy his art collection, and listen to cool jazz. 

When Zorn encounters the body of a Secret Service agent - a supposed drowning victim - it leads him to a domestic terrorist group with tentacles into the White House - a White House that does not want this death investigated. As the demands of his professional life escalate, Zorn's alternate career heats up, placing him in the middle of competing DC crime bosses feuding over a shipment of illegal arms - making Zorn the hunted and the hunter. He needs to avoid becoming the victim as he navigates the twin forces of evil closing in on him from his legitimate job - facing down political power - and his secret side job. 

Perfect for Grisham and Patterson fans