Poisoned Pairings — Lesley A. Diehl

In this sequel to A Deadly Draft, the threat of hydraulic fracturing, an environmentally controversial technique to extract gas from shale, invades Butternut Valley. Hera Knightsbridge and her fellow microbrewers fear it will pollute the water, their most precious ingredient, as well as destroy the beauty of the valley. Then murder visits Hera's brewery. When investigator and love interest Jake is called away, Hera is on her own and must confront a murderer as well as ghosts from her past.