Vitaliy Stepanov had been part of the Russian anti-doping squad, and during his work he had met and fallen in love with Yuliya, one of the country's most promising 800m athletes. But soon he discovered that his bride was not all she seemed - she was taking performance-enhancing drugs. It could have been the end of their relationship, but instead they decided they would reveal the scale and the scope of the corruption in Russian athletics - the bribes, the drugs, the abuse. At enormous personal risk to their marriage and even their lives, they recorded and filmed athletes and officials involved in the scandal, and then escaped to Germany to pass on their devastating evidence. Now, with David Walsh, the man who broke the Lance Armstrong story, they reveal the full truth of what went on in Russia, and the corrupt system that surrounded everything they did.