A mysterious black van is spotted by several people at various times in the area around Cavanaugh Street, Philadelphia's Armenian-American enclave. Presumed by some to be related to the increasing ICE raids around the area, the mystery deepens one night when a body falls out of the back of the van. Marta Warkowski, a reclusive older woman, is found bound up in a garbage bag. In a coma, she is unable to tell police how she ended up as she did. When they go to search her apartment, the police find the dead body of her building's super, a man with whom she has a history of conflict. Gregor Demarkian is pulled in once again, for a final case, to uncover the truth about the murder --- and attempted murder --- on Cavanaugh Street.

Gregor Demarkian grew up in the Armenian-American enclave in Philadelphia known as Cavanaugh Street. When Father Tibor Kasparian, his best friend and the most genuinely gentle soul he has ever met, is arrested on murder charges, it tears at the very foundation of Demarkian’s world. Demarkian is now a man possessed, and his one goal is to find out what really happened and who really is responsible for the murder with which Father Tibor is charged.

Chapin Waring was a well-turned-out debutante from one of the richest families in Alwych, Connecticut, until 30 years ago when the young debutante --- destined to attend the right school, marry the right man, and have the right life --- was revealed to a bank robber and a murderer. She disappeared, never to be heard from again. To learn why she died, Gregor Demarkian, retired profiler for the FBI, is brought in to finally solve the mysteries surrounding Chapin Waring.

Martha Heydrich is the stay-at-home wife of a very rich husband, and is rumored to be having an affair with a local teenager. One morning she seemingly vanishes from her house, and later that night her husband Arthur returns home to find the pool house ablaze.

When a high-profile missing person case comes to a tragic end, former FBI agent Gregor Demarkian searches for the truth about the disappearance 12 years before.