***1/2 The Loneliest Planet An engaged couple (Hani Furstenberg and Gael Garcia Bernal) take a vacation in the Georgian Caucasus, where a small, dangerous inciden t provokes a response that changes the rest of the trip. The increasingly brilliant American writer and director Julia Loktev wonders what happens when a stupid glitch or a selfish gesture upends your belief, be it romantic or religious. How do you go on? (133 min., PG-13) (Wesley Morris)
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