My paralyzed son sat alone in Central Park while other children avoided him, terrified of the armed men protecting him …

The key bore a number.

17.

“What does that mean?” Lucas asked.

“I don’t know yet.”

I unfolded the paper.

The writing was Catherine’s.

I recognized the graceful slant of every letter.

If anything happens, trust Elena.

The rest of the message had been torn away.