A team of young doctors on a humanitarian mission through the Amazon rainforest come to realize that not everyone – or everything – is happy to see them. Their arrival draws the attention of an ancient predator, the “Boiúna”. This ancient killer, dominant on land and water, emerges to reclaim the jungle. The ensuing fight for survival blurs the roles of hunter, prey, and hero.

Doni has lost everything. David, his best friend, is a bankrupt producer. Max is a cop who no longer believes in the law. Jack just served a five-year sentence for computer hacking. Leo has been trying to change people all his life, unsuccessfully. Inexorably, their lives cross paths…