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 European 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 is the exact resonant frequency of ancient caves, megalithic 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, the Masters X trilogy bridges acoustic science, medieval cryptography, and the absolute frontiers of human consciousness.
