剧集根据科尔森·怀特黑德撰写，获得普利策小说奖的同名作品改编，讲述黑奴女孩科拉为逃离佐治亚的种植园，而寻找传闻中的“地下铁道”，而就在寻找的过程中，她发现真的存在着字面意义的地下铁道，帮助奴隶们逃离残酷的生活。詹金斯将执导全部11集，每集1小时。

On the brink of the First World War, Albert's beloved horse Joey is sold to the Cavalry by his father. Against the backdrop of the Great War, Joey begins an odyssey full of danger, joy, and sorrow, and he transforms everyone he meets along the way. Meanwhile, Albert, unable to forget his equine friend, searches the battlefields of France to find Joey and bring him home.