Death Flies on Final — Jackie Lewin

HATED TO DEATH...

Gamely riding shotgun in her husband's Piper Arrow, Grace Beckmann and their two sons make a refueling stop at a small, isolated airstrip on their return gurney from the Carlsbad Caverns. When they find James Delacroix, whom they had met on the outward
bound journey, sprawled across his new Cadillac with a bullet hole through the heart, the Beckmanns know they are looking at murder.

Putting her sleuthing skills to work, Grace discovers that any number of people could have wanted Delacroix dead: he cheated, maligned and mistreated with equal impunity. Soon Grace uncovers some bizarre coincidences, uncanny associations, shocking revelations and lost treasure--which add up to secrets that a ruthless killer intends to make sure Grace Beckmann takes to her grave.