What if the most dangerous secret in human history isn't a weapon or a prophecy, but a frequency?
Beneath the Strahov Library in Prague, Premonstratensian monks have guarded a sealed crypt for seven centuries. A thirteenth-century brother scattered a single truth across seven cities, because what he discovered in the acoustic resonance was too dangerous to keep in one place — and too important to destroy.
Blake Masters is a graduate student who lost his security clearance and his job as a guard in the subterranean limestone vaults beneath Kansas City. But when he photographs impossible geometric carvings in an unmapped tunnel, he triggers a chain reaction that forces him to confront a terrifying family legacy.
The carvings point to a hidden acoustic signature: 111.2 Hz. It sits in the 110–112 Hz band the novel finds in ancient caves, Gothic cathedrals, and the human chest cavity. And once you learn how to listen, your nervous system is permanently restructured.
Collected here in a single omnibus edition, Masters X bridges acoustic science, medieval cryptography, and the absolute frontiers of human consciousness.
