"Gregor Demarkian grew up in the Armenian-American enclave in Philadelphia known as Cavanaugh Street. Even though he left to go to college, and then went on to a storied career in the famous Behavioral Science Unit of the FBI, he eventually returned to Cavanaugh Street after an early retirement. There he finds himself in a rapidly gentrifying urban neighborhood that still retains some of the friends, institutions, and flavor of the immigrant neighborhood...

In the wake of a double murder involving a woman who has gone missing amid rumors of an affair with a teenager, Gregor Demarkian's investigation targeting her jealous rich husband is thrown into chaos by the discovery of a stranger's body at the scene.