There's hell to pay in Philadelphia when Marty Kelly commits suicide over his wife's body in the sacristy of St. Anselm's Church. Everyone assumes that Bernadette Kelly, a diabetic, died of natural causes--until the autopsy reveals death by arsenic. But one of the nuns a St. Anselm's, certain of Marty innocence, recruits retired director of the FBI's Behavioral Science Unit Gregor Demarkian to investigate for the new Cardinal Archbishop. His Eminence, dispatched to Philadelphia to clean upa scandal, expects Demarkian to act with discretion. But when a third death by arsenic is revealed in the neighboring Episcopal Church, not even God's grace can help the priest who becomes a prime suspect--and the murderer's next victim. Moving among three combustible parishes--Catholic, Episcopalian, and rabble-rousing fundmentalist--Demarkian must negotiate his way through holy hell to find the diabolically clever killer. Only then may God's will--and a homicidal reign of terror--be done...