Gregor Demarkian is asked to investigate after a woman's body turns up in Philadelphia's St. Anselm's church, her husband, a local parishioner, commits suicide, and it is discovered that the woman was the victim of arsenic poisoning.

"Twelve years ago, Chester Morton disappeared from his hometown in Mattuck, New York, leaving no trace and never to be heard from again. For the past twelve years, his mother has kept the search for her son alive. Her determination has made his disappearance very high profile but it's also been damaging to her family, her children and to herself. Now, Chester's body is finally found--hanging from the very billboard that has been advertising his disappearance....

"In Jane Haddam's One of Our Own, Gregor Demarkian, former FBI agent and police consultant, returns for his final case-a surprising murder and an attempted murder, which threaten the safety of his Philadelphia neighborhood. 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...