Tainted Souls - Steven J. Wangsness

Detective Rick Frost washes up in the sleepy Los Angeles exurb of Santa Isidora after being cashiered by the LAPD. An everyday murder investigation draws Frost into a web of corruption that stretches from the salons of Beverly Hills to the Green Zone of Baghdad and quickly pits him against powerful forces that even the Feds fear to disturb. Before it's over, Frost will face an agonizing decision: to bring the guilty to justice, he must risk the life of the woman he loves.