Old Sins, New Sinners
Land Parrish, a New Orleans cop and his partner (and mistress)
April Flower, chase a murderer through Chicago, Ann Arbor, Istanbul and Izmir, Turkey. Two women, one an agent of the Turkish MiT, one surely not, will convince you of the maxim "The most beautiful women in the world come from Izmir."
This police procedural covers a lot of ground and a lot of old hate new enough to kill for again.