As the cab hissed to a halt in front of a derelict warehouse, his comms unit buzzed. A message appeared, bypassing his firewalls: Perché Ti Amo (Because I Love You). "Who is this?" Alessio whispered, his breath hitching.

Scrawled across the screen in jagged, glowing letters was a code he shouldn’t have possessed: .

It wasn’t just a coordinates chip; it was a ghost. For years, the legend of "Xn" had circulated through the underground—a hidden frequency that supposedly played the last honest music in a world of algorithmic noise. Alessio had spent his life chasing that frequency, driven by a memory of a melody his mother sang before the Great Sync.