'Speak No Evil' review: A frightening parable of 'F*ck Politeness.'

A lovely trip with friends descends into hellishness as our protagonists ignore increasingly crimson flags in favor of civility — it's the kind of vacation terror we last felt in Midsommar.

Co-written and directed by Christian Tafdrup, Speak No Evil is on its surface simply the story of a Danish family who becomes vacation...