When Emil found the cracked jewel-tone tin under a bed of old postcards in his grandmother’s attic, the world outside seemed to tilt. The tin was embossed with a long-forgotten brand name—Swiss Perfect 98—its letters worn but stubborn, like the last inhabitants of a vanished town. A single slip of yellowed paper lay inside, the edges browned from decades of being folded and unfolded: a string of characters, a registration key scrawled in a looping hand.