Lance Armstrong is the greatest fraud in the history of sport. David Walsh was the first person to tell the world just that. In this conversation with Francis Leach, Walsh will explore how he came to break the biggest sports story in history.

In his bestselling book "Seven Deadly Sins - my pursuit of Lance Armstrong", Walsh tells the story of how he discovered then revealed Armstrong's great lie and the toll he took for doing so. Attacked and then sued by Armstrong, reviled by his adoring fans, ostracised by the cycling authorities and abandoned by long standing colleagues in the media, Walsh paid a heavy price in pursuing the truth. Vindication would come, but at what price? And what does it say about sport and those of us who love it that we so readily believed the Armstrong myth?

SPEAKERS: David Walsh in conversation with Francis Leach