I got a message from a stranger at 2:13 a.m. It said: “Please don’t tell my sister I contacted you.” I had no idea who the person was. I replied: “Who is this?” Three dots appeared. Then: “You were at the restaurant on Saturday night, right?” I was. I had gone there alone after work and sat outside for about an hour. I told them yes. They replied: “Then you saw my sister.” I asked what that had to do with me. They sent me a photo. It was a picture of the restaurant. In the background, sitting at one of the tables, was the woman I had noticed that night. She was sitting with a man. I barely remembered her. Then the stranger sent another message: “She told our family she was working that night.” I thought they were accusing her of cheating. I almost stopped responding. Then they said: “The man sitting with her wasn’t her boyfriend.” That got my attention. I asked: “Then who was he?” They replied: “That’s what we’re trying to figure out.”