Wish You Were Here(2012)

Four friends lose themselves in a carefree South-East Asian holiday. Only three come back. Dave and Alice return home to their young family desperate for answers about Jeremy's mysterious disappearance. When Alice's sister Steph returns not long after, a nasty secret is revealed about the night her boyfriend went missing. But it is only the first of many. Who amongst them knows what happened on that fateful night when they were dancing under a full moon in Cambodia?