In 1901 BCE, a young woman named Athirat stands on a hillside north of Jerusalem and feels the earth briefly lift her a small, inexplicable rising that changes the direction of her life. She is not the last. Three thousand years later, the same hillside pulses with a 40 Hz electromagnetic signal that no instrument can explain and no scientist can ignore.

Rahul, a data scientist at NASA’s Ames Research Center, discovers the anomaly buried in four independent datasets. Anselm, a priest and intelligence operative living a double life inside a Jerusalem mission compound, receives word that a sealed underground chamber has been opened. Yousef, a municipal engineer enduring the siege of Gaza, finds a name rising in him during prayer that he is not yet ready to speak aloud. And Catalina, an atmospheric physicist, tells her colleague: it is not solar echo — and it was never going to be.