Every year, the most important folk festival in Brazil takes place on the island of Parintins, in the heart of the Amazon rainforest. As the celebration is prepared, faith, ritual and religious syncretism begin to reveal themselves as the invisible forces shaping the spectacle. Blending observation and myth, the film unfolds as a fairytale documentary, where reality gradually takes on the texture of legend. At its center is the mythical figure of the Bumbá Ox, a symbol born from the deep coexistence of different peoples – Indigenous communities, Black Africans and Europeans – whose traditions merge in the Amazon to form a unique Brazilian cosmology.