Joanne Harris's first novel, Chocolat, was set in the sleepy French village of Lansquenet, where enchantment, romance, and soft-centered truths issued from the local confectioner's shop. She returns to the same location for Blackberry Wine. But as the title suggests, she's shifted her focus from food to drink, choosing a half-dozen bottles of homemade plonk as the catalyst for her "layman's alchemy." And even the narrator is no human being but a faintly tannic Fleurie…