If it had been warm out, I would have said no. I knew about how quickly a closed car can overheat, even on a 60-degree day. But it was cool and cloudy. I’d grown up in that same town in the 1980s and had spent hours waiting in the back seat of my parents’ station wagon, windows open, reading or daydreaming, while they ran errands. Had so much really changed since then?

So I told him I’d be right back. I cracked the windows and child-locked the doors and set the alarm. When I got back five minutes later, he was still playing his game, smiling. We picked up his sister and our suitcases back at my parents’ house and caught our flight home.

It took me a while to figure out what had taken place in the parking lot — that a stranger had watched me go into the store, recorded my son, recorded the license plate on my mother’s car and called 911.