Phoebe Atwood Taylor: The Deadly Sunshade (1989)

From the Publisher:
The corpse of Lucia Newell beneath her bright beach umbrella was an awful sight. Someone must have known she had a vital matter to discuss with Asey Mayo, perhaps one even more urgent than her muffler trouble. Could that someone have been a member of the intrigue-ridden Sketicket Bay Yacht Club?

But that isn't the only problem bothering the "Codfish Sherlock" this morning. For someone had come very close to shooting him with a high-powered rifle -- not once, but twice.

PHOEBE ATWOOD TAYLOR (1909-1976) lived in Boston and Cape Cod for most of her life. In addition to the Asey Mayo series, she wrote the Leonidas Witherall mysteries under the name "Alice Tilton," and, as "Freeman Dana," Murder at the New York World's Fair.

Phoebe Atwood Taylor: The Deadly Sunshade. An Asey Mayo Cape Cod Mystery. Countryman Press / Foul Play Press, ISBN: 0881501360 (April, 1989), 297 p., $5.95.