“Rose” (Elizabeth Reaser) is married to talent agent “Sammy” (Walton Goggins) and they are preparing for a make-or-break party at their home one evening when the sound of a repetitious car horn sends her out to investigate. That’s when she meets “Helen” (Lois Smith). She’s an elderly lady convinced that she lives in their house, and when “Rose” takes her in whilst trying to summon some help her presence seems to galvanise her family and their guests into a series of revealingly uninteresting and cocaine-induced home truths that drags the whole thing into the doldrums of a melodrama populated by...