Ed sets out to find the cause of some mysterious white lines, covering a vast area in an uninhabited expanse of swamp on Kimaam Island - also known as Yos Sudarso - in West Papua. Helped by a team of travelling missionaries, he gets close to his target before having to venture alone into the swamp. It's slow progress and, as Ed closes in, his adventure takes a totally unexpected turn when he finds a group of indigenous people living in what was thought to be an uninhabitable swamp. As the mystery deepens, Ed is led to a settlement no outsiders have ever visited before. Among the villagers he undergoes a tribal initiation, and discovers a startling insight into an ancient way of life.