The plot of this sounds a bit like that of “Carnage” in that both films involve two sets of parents getting together to sort out a problem involving their sons.
Joel Edgerton literally does it all in this anxiety-inducing thriller. It’s somewhat of a concept piece, with the conceit whereby a figure from the past re-emerges in order to make one reassess the status of your present state. At 108 minutes it never outstays it’s welcome and will leave many wishing there was more to follow in the form a finite resolution. It ends in delicious, if horrific ambiguity.