I waited until the plane had left the gate, then pulled the card from my pocket with trembling fingers. On the back, written in a child’s blue marker, were six digits and one word: “Vault.” My phone buzzed. It was a message from Caleb, sent from a tablet. “Mom, Dad is not taking me to school. He is taking me to sell something, and he needs my signature. Do not let him get the card. Please.” My knees nearly gave way.

I called the number on the card and the bank’s private line answered after one ring. “Ms. Calloway,” a man said gravely, “we have been expecting you since this morning. Your son opened this account three months ago with the help of his late grandfather’s attorney.” Then he lowered his voice. “Before I say more, you should know that two men in dark suits just walked into our branch asking for you by name.”