My brother vanished on the night of his prom—23 years later, I spotted someone who looked exactly like him 3,000 miles from home.

He took a deep breath.

“I was looking for tools in the garage and found an old metal box pushed way back on a shelf. There were papers in it. A birth certificate with a different name on it. A social security card. Old photographs of people I didn’t recognize.” He glanced at me. “He caught me with the box. He didn’t yell. He just sat down and made me continue reading …