My 8-year-old daughter said her friend “smelled funny,” and I almost scolded her right there in the middle of the school. That same afternoon, I realized she wasn’t being mean… she was crying out for help on behalf of another little girl.

There was a change of clothes, an old ID card for a woman named Marisol Hernandez, a powered-off cell phone, a half-empty blister pack of antibiotics, and a napkin with an address written on it:

“Gray building. Rooftop unit. Don’t let Rose throw away the key.”

Sophie started to tremble so violently that I pulled her into a hug.