Marco printed the PDF at dawn. As the pages slid warm from the laser printer, his own radio—an old Sangean ATS-909—crackled to life. It hadn’t been turned on in years. The dial spun slowly, by itself, stopping at 6.925 MHz, upper sideband.

The PDF wasn’t a document. It was a key.

“This is Radio Lina. Test, test. If you’re reading this, you’re on my frequency now. Don’t reply. Just listen. I’ll tell you where they buried the others.”

The PDF was her logbook.