Percy Fawcett was a man obsessed. A fearless British explorer, he believed in the existence of a lost city deep in the Amazon rainforest—an ancient civilization he called Z. In 1925, he set out on what should have been his greatest discovery, venturing into the heart of the jungle with his son and a small expedition team. But then, the world heard nothing.

No letters. No distress signals. No bodies.

Fawcett and his team vanished without a trace. Theories have swirled for nearly a century. Did they succumb to disease? Were they attacked by hostile tribes? Or—more chillingly—did they find something so incredible that they never wanted to leave?

His story has inspired books, films, and endless speculation. But the ultimate question remains: What really happened to Percy Fawcett in the depths of the Amazon?