A celebrity model couple are invited on a luxury cruise for the uber-rich, helmed by an unhinged, alcoholic captain. What first appears Instagrammable ends catastrophically, leaving the survivors stranded on a desert island in a struggle of hierarchy.

Triangle of Sadness lacks the sharp edges of Östlund's earlier work, but this blackly humorous swipe at the obscenely affluent has its own rewards.

With an intriguing premise held back by uneven execution, Triangle of Sadness has some sharp points as well as some lopsided angles.