Deadly Nightshade

Description for DEADLY NIGHTSHADE by Cynthia Riggs:

Martha's Vineyard has been home to Victoria Trumbull for most of her 92 years. Its magic, history, and picture- perfect calm are part of her very being. But one evening, Victoria hears something that doesn't quite belong--a scream followed by a splash and the sound of a car speeding away. That night, a mutilated body is discovered on the outgoing tide.

With her granddaughter Elizabeth, Domingo the harbormaster, a swarm of Island locals, and a few mysterious visitors, Victoria manages to get in a good bit of detective work-- while still finding time to cook her traditional Saturday night supper of Boston baked beans. She even concocts a scheme to trap the killer, but she'll need to act quickly-- victim number two has just been found.

This is #1 in A Martha's Vineyard Mystery.