At the dawn of the 20th century, British explorer Percy Fawcett is drawn to the mysterious Amazon jungle, where whispers speak of a lost civilization. Obsessed with discovering the legendary city of Z, a place said to harbor unimaginable knowledge and treasures, Fawcett leaves his family behind to embark on a perilous expedition. Although his initial journey to Brazil ends in failure, he cannot shake the feeling that his quest is destined to change the course of history.
As Fawcett delves deeper into the jungle, he faces not only the relentless challenges of nature but also the resistance of a society that doubts his vision. With pressure from his family, especially his wife, who fears losing him in his pursuit, and the skepticism of the British Museum, which views his ambition as folly, Fawcett perseveres, convinced that ancient cultures are not the barbarities his colonial society has labeled them.
With the support of his son Jack and a Brazilian traveler, Fawcett becomes a pioneer who defies the conventions of his time. However, his determination leads him to an uncertain fate deep within the jungle, leaving his family behind and sparking speculation about his tragic disappearance. The film is an emotional journey about ambition, family, and the yearning to discover the unknown.