In a time of flatulent ambitions that, more often than not, fall face first, a film that knows what it wants and does what is essential to achieve the same is quite a treat. If I had to, and by no means do I have to, bring up one area where Peter Hengl’s directorial debut, “Family Dinner,” could have benefitted from a bit more thought, it would be the discernible lack of a singular drive tying up peculiarities of actions of premeditations. But thematic ambiguity has a charm of its own. It is, through conscious devising or not, far eerier when the monstrosity doesn’t have an evident origin, or even a determined goal, for that matter. Sharing its myriad themes with the Fantastic Fest winner Spanish thriller “Piggy” and one of 2022’s more scarring horrors, ‘Speak No Evil’ takes nothing away from “Family Dinner” in the bigger picture.