It's Mississippi in the summer of 1955, and Rose Lee Carter can't wait to move north. For now, she's living with her sharecropper grandparents on a white man's cotton plantation. Then, one town over, an African American boy, Emmett Till, is killed for allegedly whistling at a white woman. When Till's murderers are unjustly acquitted, Rose realises that the South needs a change and that she should be part of the movement.