My ten-year-old daughter complained of a toothache, so I made plans to take her to the dentist. Out of nowhere, my husband insisted on tagging along. During the exam, the dentist kept shooting him strange looks. As we were heading out, the doctor discreetly slipped something into my coat pocket. When I read it later at home, my hands began to shake, and I drove straight to the police station.

He must have seen something happen in my face, because he stopped speaking and let silence do its ugly work.

Then he took out a blank prescription pad, wrote something quickly, folded it once, and slid it under my hand.

“When you get home,” he said quietly, “look closely at a few things. Her room. Her routine. Her laundry. Anything she sleeps in.”