In the early 1990s, Justin Pourier was a maintenance man at Red Cloud Indian School, a Catholic school on the Pine Ridge Reservation in South Dakota. One day, he says he stumbled upon small graves in the school’s basement. For nearly 30 years, Pourier would be haunted by what he saw and told no one except his wife. “Those are Native children down there…hopefully their spirit was able to travel on to whatever is beyond this world,” Pourier says.