After entering a remote jungle in South America, four British explorers encounter something that seems impossible, inconceivable, and unimaginable. And, yet, it’s still there. Pterodactyls soar above them while stegosaurs, tyrannosaurus rexes, and humans’ ancestors walk amongst them. The discovery is groundbreaking and their renown will know no ends if they live to tell the tale and return to London. But in the dangerous new territory, their fate is always uncertain.