Deadly nightshade

"Victoria Trumbull has lived most of her ninety-two years on the Island. Martha's Vineyard, its magic and its history, is part of the texture of her life. Like other Islanders, she knows the sounds of the sea in calm and stormy weather and she knows the sounds that do not belong. One evening while Victoria waits on the dock for her granddaughter to return with the harbormaster, she hears a chilling scream followed by a splash and the sound of tires skidding on sand. She investigates and discovers a mutilated body floating on the outgoing tide."--Jacket.