I was standing in line at the grocery store, half-reading emails on my phone and half-thinking about dinner, when I noticed the girl in front of me. She couldn’t have been older than fourteen. In her hands was a small chocolate birthday cake decorated with pink frosting flowers. When the cashier announced the total, the girl counted her money twice before her shoulders sank. “I’m sorry,” she whispered. “I’m four dollars short.” Then she slowly pushed the cake back across the counter.

Something in her voice stopped me. I handed the cashier five dollars and told her I’d cover it. The girl stared at me, then suddenly hugged me. “Thank you,” she whispered. “It’s for my mom. This will be her last birthday.” She hurried away with the cake, leaving me speechless. But minutes later, outside the store, I reached into my jacket pocket and found something that should have been impossible: my mother’s silver watch, missing for sixteen years, with a note attached. What happened next revealed that meeting this girl was no accident. Continue below.