It’s 1986, and Gene Baur is selling vegan hotdogs at Grateful Dead shows. Surrounded by the sounds of Jerry Garcia and company, Baur spends his time educating fellow “Deadheads” about the cruelties of animal agriculture, providing firsthand accounts from his investigations at factory farms, stockyards and slaughterhouses. Then Baur finds Hilda, a discarded sheep left for dead at a stockyard in Pennsylvania. What started as Baur’s act of compass…