It’s measured in helplessness.

Nobody calls at 2:47 in the morning with good news—especially not the principal of your child’s school, and definitely not when your seven-year-old daughter should be asleep in bed.

“Mr. Carter,” the voice said carefully, “this is Principal Daniels from Oakridge Elementary. I’m sorry to wake you, but we have a situation involving your daughter, Lily.”

I sat straight up in the hotel bed so fast the lamp rattled against the nightstand. Outside the window, the skyline of Seattle glowed faintly in the darkness while my brain struggled to process what I’d just heard.

I was supposed to give a presentation at 9 a.m. about pediatric emergency care.

Meanwhile, my daughter was across the country in Chicago, staying with my wife Amanda and her parents while I attended the conference.

“What happened?” I asked. “Is Lily hurt?”

There was a pause.

“She arrived at the school about an hour ago,” the principal said quietly. “She walked here alone.”

My stomach dropped.

It was two in the morning in Chicago.

Seven-year-olds don’t walk across a city at night unless something is terribly wrong.