The Windsor Knot by Sharyn McCrumb
If forensic anthropologist and amateur sleuth Elizabeth MacPherson is to have tea with the Queen of England, she has to get married first. And in the space of five weeks, she plans to do just that. When an old neighbor receives word that her husband has died again, it's up to Elizabeth to determine just whose ashes the double widow has been cursing at all these years.
New York: Ballantine, 1990