Filmmaker Pete McBride and writer Kevin Fedarko set out on a 750-mile journey on foot through the entire Grand Canyon. But their quest was more than just an endurance test, it was a way to draw attention to the unprecedented threats facing one of our most revered landscapes. An astonishingly diverse and powerful landscape, is now facing perhaps its gravest crisis. A story of extreme physical hardship that stretches the bonds of friendship, and a meditation on the timeless beauty of this sacred place.