The Lost City of Z by David Grann is not my normal reading material, but it proved far more valuable than I expected. On the surface it is the story of Colonel Percy Fawcett, the British explorer who disappeared in the Amazon in 1925 while searching for what he believed was a lost ancient civilisation. Yet the book is more than a simple tale of jungle adventure. It is part biography, part historical investigation, part travel narrative, and part study of obsession. Grann follows Fawcett’s career, his repeated expeditions into South America, his growing belief in the existence of the city he called “Z”, and the later attempts by others to solve the mystery of his disappearance. The book was published in 2009 and later became the basis for the 2016 film of the same name.

What makes the book useful is not merely the mystery, but the way Grann places exploration inside its proper historical setting. Fawcett belonged to that last generation of imperial explorers who operated between science, ambition, nationalism, romance and personal madness. He was not simply wandering into blank spaces on a map. He was moving through lands already occupied, already known to Indigenous peoples, and already shaped by their own histories. That is one of the strengths of the book. It shows both the courage and the arrogance of the explorer tradition, and it reminds the reader that the so called unknown world was rarely unknown to those who lived there.

For those interested in the lost valley pulp genre, this is invaluable material. The usual pulp ingredients are all here: the vanished expedition, the hidden civilisation, the dangerous jungle, hostile terrain, rival theories, strange rumours, unreliable maps, and the sense that beyond the next river bend there may be something extraordinary. Yet Grann’s account is grounded enough to make those elements more useful rather than less. He shows how real exploration was slow, uncomfortable, hungry, diseased, confused and often badly planned. That is precisely what pulp adventure needs if it is to feel more than theatrical. The jungle should not simply be scenery. It should be an active force. Rivers, insects, heat, sickness, distance, hunger, bad information and cultural misunderstanding all become enemies in their own right.

The book is also a warning against making explorers too clean or heroic. Fawcett is fascinating because he is difficult. He is brave, determined and often more open minded about Indigenous societies than many of his contemporaries, but he is also obsessive, stubborn and capable of dragging others into danger because of his own certainty. That tension is useful for gaming and fiction. A good lost valley campaign should not only ask whether the explorers can survive. It should also ask why they are there, what they think they are entitled to take, and what price others pay for their ambition.

Grann’s own journey into the Amazon gives the book a second layer. He is not content simply to retell Fawcett’s story from old papers. He follows the trail, interviews people, examines competing explanations, and brings modern archaeology into the discussion. The result is a book that keeps the romance of the lost city myth while also challenging it. The possibility that the Amazon once supported complex societies gives Fawcett’s dream a stronger basis than simple fantasy, but Grann avoids turning that into cheap adventure spectacle. He is interested in how myth, evidence and obsession feed one another.

As a piece of reading for the lost valley pulp genre, The Lost City of Z is probably more useful than many actual pulp novels. It gives the designer or writer a storehouse of practical atmosphere: expedition planning, supply failure, unreliable guides, rumours of ruins, river travel, disease, exhaustion, jungle navigation, and the slow collapse of confidence. More importantly, it gives a sense of how the lost world genre can be handled with more depth. The best pulp adventure is not just men in hats shooting at monsters. It is the collision between ambition, fear, greed, scholarship, myth and landscape.

This is not a book I would have normally picked up for pleasure reading alone, but I am glad I did. For anyone writing or designing lost valley adventures, jungle expeditions, vanished civilisations or pulp exploration games, it is essential background reading. It provides the romance, but also the mud beneath it. That is what makes it so valuable.