I just watched a screener for this movie. http://www.imdb.com/title/tt2300552/ It's a documentary of a film maker who was making a movie, then took it and disappeared. The documentary focuses on the mysterious circumstances surrounding his disappearance. He was filming a movie called 'Demonic'. The documentary interviews several of the people involved in the making of 'Demonic'. Among those interviewed are actor Tom Sizemore, and the assistant director, other actors and the producer.
Eventually, the director is found. That is when the documentary takes a dark turn. Something happened on that set, but nobody seems to be willing to discuss it. Perhaps the documentarian should have left well enough alone. Maybe there's a good reason nobody wants to talk about it.
My good friend, James Cullen Bressack was one of the writers of this movie. I recently got the chance to meet him in person at the Tucson Terrorfest: Horror Film Festival where he was screening his film, 'Pernicious'. That was an amazing movie, full of beautiful Thailand scenery. The horrific events depicted in it are based on actual Thai superstitions and folk lore.