Ireland, 1905: Percy Fawcett is a young British officer participating in a stag hunt on an Irish baronial estate for the benefit of the visiting Archduke Franz Ferdinand of Austria. A skilled horseman and marksman, he brings down the stag swiftly but is snubbed at the after-hunt party. A year later, Fawcett is sent to London to meet with officials of the Royal Geographical Society (RGS). The governments of Bolivia and Brazil are nearly at war over the location of their mutual boundary, and have asked the British government to survey it. Fawcett agrees to lead the survey party to restore his family's good name. Aboard a ship to Brazil, Fawcett meets Corporal Henry Costin, who has knowledge of the Amazon rainforest. At a large rubber plantation in the jungle owned by the Portuguese nobleman Baron de Gondoris, the two meet Corporal Arthur Manley, who tells them that the British government advises against further exploration. Fawcett, with several guides and the Amazonian scout Tadjui, completes the mission. Tadjui tells Fawcett stories about a city in the jungle covered in gold and full of people. Fawcett dismisses such stories as insane ravings, but discovers highly advanced broken pottery and some small stone statues in the jungle that convince him of the veracity of Tadjui's story.

Fawcett is praised upon his return, where his wife, Nina, has given birth to their second son. In the Trinity College Library, Nina discovers a conquistador text which tells of a city deep in the Amazonian jungle. Fawcett meets the renowned biologist James Murray, who agrees to back Fawcett's expedition to the Amazon to find what Fawcett calls "the Lost City of Z". Fawcett attempts to convince the members of the RGS to back the expedition, but is publicly ridiculed. Nevertheless, the RGS backs the expedition to further exploration of the Amazon basin. Murray, unfamiliar with the rigors of the deep jungle, slows the party down significantly. Fawcett's party is attacked while traveling along the river. However, Fawcett makes peace with the natives. Murray suffers a severe knee injury which becomes infected, and he begins to go mad. Fawcett sends him off with a native guide and the group's last pack animal to find aid. Fawcett's team are forced to abandon the expedition after discovering that Murray poured paraffin on their remaining supplies.

Murray survives and, in front of the RGS trustees, accuses Fawcett of abandoning him in the jungle. Fawcett elects to resign from the society rather than apologize. World War I breaks out in Europe, and Fawcett goes to France to fight. Manley dies in the trenches at the Battle of the Somme, and Fawcett is temporarily blinded in a chlorine gas attack. Jack, Fawcett's eldest son

https://en.wikipedia.org/wiki/The_Lost_City_of_Z_(film)
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