An explosive video goes viral, showing a white school resource officer in South Carolina forcibly remove a Black teenager from her school desk and throw her across the floor. An outraged nation divides over who is at fault and what role race played in the incident. One woman uproots her life to help the girl and dismantle the system behind the "Assault at Spring Valley,” including facing the police officer. Against the backdrop of a racial reckoning and its deep historical roots, a searing moment illuminates a persistent American power structure.