The gunman leant forward and pushed the pistol hard into Manie Potgieter’s neck. “Listen, you white bastard,” he whispered, his breath heavy with alcohol. “I have Aids. We are now going to rape your wife and give her Aids too. Then, we kill you, got it?” From his position on the floor, hands tied behind his back, he could hear his assailant’s three accomplices pulling the tracksuit bottoms off his wife, Helena, 28. “I was sure they were going to shoot me, but I just prayed she would be OK. She was telling me in Afrikaans not to worry. I...