This is the story of Dawie Groenewald, an accused rhino horn trafficker, and John Hume, the owner of the world’s largest rhino farm—two men who know each other well and share a common goal: to end the South African and international bans on trading and selling rhino horn. Groenewald has agreed to see Brent and me at a time when he is in a high-stakes legal battle that could land him in prison for decades or create an opening for the legal sale of rhino horn in South Africa—an opening that could help pave the way to a legal global trade, which opponents say could doom rhinos