Happy Are the Peacemakers — Andrew M. Greeley

Rich, beautiful, seductive ... and suspected of murder. Nora MacDonaugh had bad luck with husbands: they both died under mysterious circumstances. Her latest, an Irish millionaire, had changed his will in her favor a week before the bomb went off in his study. Was it political terror? Suicide? Or the work of a very clever Black Widow? Bishop Blackie Ryan is the only man who can resist the widow's charms ... and solve the perfect crime.