The narrow Darién Gap, the only land bridge connecting South and Central America, encompasses a spectacularly hostile jungle, covered in steep mountains, dense rainforests, and flood-prone marshes. Known in Spanish as el infierno verde, or "the green hell," it is one of the most inhospitable places in the world. Its terrain is too treacherous for roads, yet hundreds of thousands of refuge seekers contend with its horrors every year in the hopes of reaching the United States, still some three thousand miles away. And of the countless who set out for the border, an untold number never arrive.

In this book, journalist Belén Fernández travels through the Darién Gap to report on the dehumanizing and deadly stretch of land that has become a mass graveyard for migrants. Fernández's journey brings her into contact with refuge seekers, people smugglers, law enforcement officials, and many more whose stories bring life to a place overwhelmingly associated with death. Combining history, on-the-ground reporting, travelogue, memoir, and searing politico-economic analysis, she shines light on a largely made-in-the-USA crisis that has come to define our modern era.