The folder snapped open. Inside weren't spreadsheets or logs, but a series of high-frequency audio files and a single text document titled GBGFDS—Ground Based Geophysical Frequency Data Stream .

The progress bar stalled at 99%. A prompt appeared: Verification Required. State the Vow.

"We've been looking for that stream, Elias," the taller one said, not waiting to be invited in. "The River is loyal, but it only talks to those who know how to listen."