The trouble with Harriet / Dorothy Cannell.

Enhanced descriptions from Syndetics:

After her hard domestic labor in The Spring Cleaning Murders (pronounced "wickedly witty" by the Chicago Sun-Times) all Ellie Haskell wants is a romantic getaway with her dashing husband, Bentley. Their bags are all packed for a trip to France...until the arrival of Ellie's long-lost father, Morley Simons, toting the ashes of his platinum blond lady love, Harriet--a femme fatale who has become a highway fatality. He has promised to return the ashes to her relatives. But when another accident makes Morley a murder suspect, Ellie must ask herself: is he a pawn in a deadly game? And how can she save him from arrest? Furthermore, how does an absent-minded vicar's obsession with eleventh-century St. Ethelwort--patron saint of virility--relate to the mystery and to the secrets of her own heart? Soon it's clear that love can be a very dangerous thing.