The Sweet Fraction

A cryptic letter from her dying sister lures Isabel Salas to a crumbling Louisiana island estate where the walls sweat, the pipes pulse with the tide, and nothing served at the table is truly water. The Naquin family has kept their patriarch alive for nearly two centuries by draining the bodily fluids of captive brides—and now they want Isabel. Trapped before the equinox tide with no ferry and no allies, she must turn the house's own plumbing against the ancient organism feeding beneath its foundations, or watch her sister be rendered into salt.