On May 4, 2004, David Reimer drove to a supermarket car park and, still sitting in the car, pulled out a shotgun and killed himself. At 38, he ended a life that had been so full of pain and anguish that some who knew him were only surprised he had battled on for so long. From when he was only a few months old until into his teenage years, David had been subjected to a perverse, cruel and disastrously misguided experiment by a celebrated sex psychologist who was determined to show the world that he could transform a boy into...