September mourn / Mary Daheim.

Enhanced descriptions from Syndetics:

Fall has fallen upon Judith McMonigle Flynn, leaving her Hillside Manor nearly devoid of guests. And what better cure for the off-season blahs than a brief bout of B&B sifting for a friend amid the quiet rustic splendor of secluded Chavez Island? Judith and cousin Renie both are more than ready for some relaxation. But their peace goes to pieces when Renie conks an odious interloping blowhard on the noggin with a heavy china dish-and, moments later, the woozy lout takes a fatal tumble down an inconvenient staircase. Judith suspects that death by dinnerware was not the real cause of this fellow's demise. But to prove her cantankerous cuz innocent, she'll have to uncover the real killer from among the motley island crew. And that could pile a lot more nastiness on Judith's plate than the harried bed-and-breakfast hostess can consume in one sitting!