Die, My Dear (2017) online

Victor and Miranda attempt to resolve the conflicts within their failing marriage over the course of a final dinner date. After failing to salvage their relationship, they reveal their sinister true motivations for the meeting; to murder the other. Having both successfully poisoned the other during the meal, the pair face off against the inevitability of their unexpected and untimely fates, as they square their shoulders toward a poison whose symptoms were customized to be as brutal and painful for its intended target.