I woke up alone in Thailand with no phone, passport, or flight home. My husband left only one cold note behind. That decision changed everything.

Suddenly, an old, seemingly useless piece of data floated into the forefront of my mind. A seven-digit sequence.

Years ago, my former director, Martin Shaw, had instituted a mandatory safety drill. He forced every senior consultant to memorize one international emergency contact number. I had mocked him relentlessly for it. No one memorizes numbers in the digital age, Martin, I had teased. Exactly, he had replied, utterly humorless.