In December of 2004, after more than a year of investigation, San Francisco Chronicle reporters Mark Fainaru-Wada and Lance Williams broke the story that in a federal investigation of a nutritional supplement company called BALCO, Barry Bonds and fellow slugger Jason Giambi had admitted to taking steroids. Immediately the issue of steroids in baseball became front-page news. In Game of Shadows, Fainaru-Wada and Williams expose the secrets of BALCO, illuminating how professional athletes risked their health for a competitive edge.