Welcome to the Amazon River basin, home to the greatest biodiversity on planet Earth. The people here believe that the world is suspended in the air above seven trees, they believe in the power of spells and shamans, and they face the reality of dangerous tropical diseases. You are a young doctor anxious to help the forest people fight an epidemic and also learn about natural plant medicines. But not everyone welcomes your help. How do you convince them that your work is imperative to their future? When people around you start vanishing, you realize that this tropical place has a few more secrets to reveal.