Montana filmmaker Casey Anderson has formed a remarkable relationship with one of America’s most powerful predators, a mountain lion named Mama Mo. Casey first discovers Mama Mo one winter night when tracks in the snow appear outside of his home in Paradise Valley, Montana. It sparks Casey’s year-long obsession with the adult mountain lion and her cubs who are hunting in his backyard. Astonishingly, Mama Mo lets him into her world, and Casey uses the latest high-tech tools to capture an unprecedented view into the intimate lives of mountain lions in the wild.