Academy Award-winning Passion Pictures and HHMI Tangled Bank Studios present one of the most important, but untold, science stories of our time—a tale with profound implications for the fate of life on our planet. Beginning in the 1960s, a small band... (more) of young scientists headed out into the wilderness, driven by an insatiable curiosity about how nature works. Immersed in some of the most remote and spectacular places on Earth—from the majestic Serengeti to the Amazon jungle; from the Arctic Ocean to Pacific tide pools—they discovered a single set of rules that govern all life. Now in the twilight of their eminent careers, these five unsung heroes of modern ecology—Bob Paine, Jim Estes, Mary Power, Tony Sinclair, and John Terborgh—share the stories of their adventures, and how their pioneering work flipped our view of nature on its head. Across the globe, they discovered that among the millions of species on our planet, some are far more important than others. They called these species “keystones” because they hold communities of plants and animals together, just like a keystone holds a stone arch in place. When keystones are removed, ecosystems unravel and collapse—a phenomenon no one had imagined or understood until their revolutionary discoveries. But with new knowledge also comes new hope, and these same visionaries reveal the remarkable resilience of nature—and how the rules they discovered can be used to restore the natural world, from American lakes to war-ravaged African parks.