A group of young people become lost in the jungle during a river rafting trip and stumble upon a long lost ruin that is home to a host of mysterious monsters.

Over the course of one night, Sarah meets the handsome, captivating and smooth talking Lewis, who aims to be the bait in a sick sexual trap set up by himself and his low-life, rich kid housemate Kenneth. When their ruse backfires, Lewis and Sarah are forced into an unlikely alliance with deadly consequences.