The Lost Tribe (1983)

"Altered states. Deadly fates."

Anthropologist Max Scarry mysteriously disappears while doing excavation/research of a lost New Zealand tribe on a remote island. His wife and his twin brother Edward are clueless as to what could have happened, a situation complicated by their city's police suspecting that one of the brothers murdered a local prostitute who was found with a strange tribal charm on her body matching one found in Max's abandoned hut. What most certainly isn't helping matters is the strange behavior of Max's daughter as she seems to have visions beyond possibility, warnings of a supernatural threat and her uncle's fate - and she's the film's narrator, to boot. Edward decides to go to the island to find out exactly what happened, but the deeper he goes into the mystery the more perilous and unknowable his world becomes, leading towards a shocking fate that raises more questions than it answers. (cont. http://view-from-the-paperhouse.blogspot.de/2014/10/the-threat-of-ancient-echoes-lost-tribe.html)