When a distant emergency summons the wealthy Bennett family back to the U.K., disrupting a vacation on the Mexican coast in Acapulco, simmering tensions rise to the fore between scions Alice (Charlotte Gainsbourg) and Neil (Tim Roth). The delicate balance of the deceptively close‐knit clan, including siblings Colin and Alexa (Samuel Bottomley, Albertine Kotting McMillan), is irrevocably upset.

Continuing his exploration of individuals and societies under pressure, writer‐director Michel Franco (New Order) ascends to the heights and depths of an Acapulco — and a family — that is more than meets the eye. Playing out in the sleek hotel suites and scruffy tourist haunts of a disparate and stratified seaside locale, and across the psychological battlefield of a precarious dynasty, Sundown unfolds in sharp, surreptitious bursts.