Caleb Gayle tells the story of the Creek Nation, a Native tribe that two centuries ago both owned slaves and accepted Black people as full members. A chief named Cow Tom - a former Black slave - created a treaty with the U.S. government which recognized Creek citizenship for its Black members. This equality was shredded in the 1970s when Creek leadership canceled citizenship to Black Creeks, even those who traced their tribal history back generations. The result is an eye-opening account that challenges our idea of identity, marginalization and white supremacy in America.