I took my boyfriend’s daughter to the amusement park. It was a fun evening, but it ended in tragedy. We got in an accident on one of the rides, and I was the only survivor. My boyfriend and I grieved for months, and I finally felt ready to move on. “We can always make one of our own,” I said. And he was convinced. Eighteen years later, we were packing our son’s things when he saw the clothes I was wearing that day. He froze.