Trumpet of Death

When 92-year-old poet/sleuth Victoria Trumbull takes her city-bred tenant Zack Zeller on a nature walk on one of Martha's Vineyard's conservation areas and shows him a mushroom she calls black trumpet of death, he's sure he's found the way to rid himself of his troublesome girlfriend, Samantha. But the mushrooms he's given Samantha end up on her daddy's dinner table, and Zack, one of the invited guests, is sure he's doomed the diners to an untimely death.