"You can sing and dance, day and night, in my village". With these words, Silva, King of Bane Ijun, welcomes the eight children of Fleur de Lampaul to his island in the Bijagos Archipelago. An amazing journey begins for these young people from Europe who will share the daily life of an animist community of black Africa during three months. In the heart of this preserved natural paradise - but sometimes dangerous - they will seek to understand the subtle links that bind the Bijogo people to nature. Great Men know everything about the sea and the forest, full of innumerable animals, Gambian rats with rare marine hippopotamuses, but also formidable spirits. They will lead the crew of the oceanographic sailing boat of children in a real journey to the sources of the world, to the borders of the visible and invisible realm of one of the last Water Peoples.