The Porcupine Caribou herd is one of the largest caribou herds in North America but its future is uncertain. Climate change, industrial development, national and international political posturing and a rapidly changing north are all putting the herd and its home range at risk. The Gwich'in people who have relied on the herd for generations also see their future hanging in the balance and they need the rest of the world to notice. In this short documentary, aspiring wilderness photographer Peter Mather puts everything on the line in his quest to capture one photo that will help tell the story of the greatest land migration on earth.