**SUNDOWN** is a new psychological mystery drama from director Michel Franco. The story follows a wealthy British family who is vacationing in Acapulco when a distant emergency disrupts their plans. The simmering tensions between the group members come to the fore as they try to figure out what is going on and how to deal with the situation. Tim Roth and Charlotte Gainsbourg give strong performances as the patriarch and matriarch of the family, respectively. The rest of the cast is also excellent. The film is slow-paced and gently suspenseful, with plenty of twists and turns to keep viewers…