By manipulating archives from the transitional period between the 19th and 20th centuries in Brazil, Renato Neumann narrates the early exploitation of rubber plantations in regions of the Amazon, the absorption and transformation of rubber in European society, and its political and economic consequences for the territory in question. The story focuses on highlighting the figure of Plácido de Castro, a significant personality in the conflicts that occurred between Brazil and Bolivia in the early 1900s.