In 1971, 12-year-old Lesley Cairns was a South African swimming phenom with big Olympic dreams. But because she was classified as “coloured” by the apartheid regime, you won’t find her swimming scores in the record books. Or anywhere. She crossed a line she didn’t know existed—one that led to a harrowing visit from the secret police. In this four-part series, Lesley and her brother, Patrick Cairns, dive into a family secret that reveals the role that sport played in their country’s liberation movement.