A woman whose body is found in a Philadelphia church is believed to have died of natural causes. When the coroner finds arsenic, the police think her husband, who has committed suicide, was responsible. A nun doesn't think so and asks Gregor Demarkian, retired head of the FBI's Behavioral Science Unit, to investigate. When a third death occurs in a neighboring church, Demarkian must find a diabolically clever killer. Martin's Press.

True Believers 2002, Minotaur Books, New York, NY

ISBN-13: 9780312982867

Mass-market paperback

True Believers 2001, Minotaur Books, New York, NY

ISBN-13: 9780312209292