Alice (Charlotte Gainsbourg) and Neil (Tim Roth) spend their vacation in a famous Mexican resort. The luxurious idyll is interrupted by an unexpected phone call that will force them to change their plans, and Neil will be tempted to completely change his life. Set between luxury and misery, privilege and its lack, the fullness of life and its decline, "Sundown" asks the most important questions about what really makes us happy. Money? Love? Bonds? Or maybe the lack of them?