The last survivors of the so-called `comfort stations" in wartime Asia, where hundreds of thousands of women were forced into sexual slavery and exploitation by the Japanese military. Krishnan Guru-Murthy follows 92-year-old campaigner Lee Yong-soo, known affectionately as Grandma Lee, who wants justice before it's too late. On a journey to the South Korean capital of Seoul, Lee recounts how she endured rape, electric shocks and torture at the hands of her captors.