My 7-year-old whispered at bedtime. “Mommy, the bus driver stops at a house sometimes.” I said, “What house?” She said, “A gray house. He tells us to stay quiet. He goes inside. Sometimes 10 minutes.” over minutes. I called the school. “Mr. Doyle has been driving Route 12 for 18 years. There’s no unauthorized stops.”

“Nathan used to leave notes for his mother in that box. After he disappeared, Margaret started leaving letters for him there. Every day at first. Then every week. She believed he would come home and find them.”

“Why were you taking them?”

“I wasn’t taking them,” he said. “I was collecting the ones someone else had been moving.”