Concussion in rugby has forced the sport into an existential crisis. With household names, including England World Cup winner Steve Thompson, suffering from early onset dementia, one of the great global games is having to face up to searching questions about the way it is - and has been - played. Sam Peters is the journalist who has led an often lonely campaign to bring the risk of brain injuries to the attention of the sport's administrators, coaches, players and the paying public. Here, ahead of the launch of his book, 'Concussed, Sport's Uncomfortable Truth', Peters spells out the huge challenge rugby has in coming to terms with the dangers associated with physical contact. A lover - and former player - of the game himself, he describes the conflict of interest he felt while reporting on a sport enjoyed by millions, and offers his views on how rugby can find a future.