The 1940s. Three young brothers decide to embark on a great adventure. Orlando (27), Cláudio (25), and Leonardo (23)—the Villas-Bôas brothers—enlist in the Roncador-Xingu Expedition and set out on a pioneering mission across Central Brazil. Their saga begins with the crossing of the Rio das Mortes; they soon take charge of the endeavor, becoming deeply involved in defending Indigenous peoples and their diverse cultures, while documenting everything in a journal titled A Marcha para o Oeste (The March to the West).