The fourth Payne and Jones thriller from New York Times bestselling author Chris Kuzneski.

“A reader's delight from beginning to end. Tautly written, expertly told, smart, and exhilarating.”—New York Times bestselling author Steve Berry

Carved into the towering cliffs of central Greece, the Holy Trinity monastery is all but inaccessible. Its sacred brotherhood has protected its secret for centuries. In the dead of night, the monastery’s sanctity is shattered by an elite group of warriors carrying ancient weapons. One by one, they hurl the monks from the cliff-top to the rocks below—the holy men taking their secret to their graves.

Halfway across Europe, Richard Byrd has uncovered the location of a magnificent treasure, but there are those who will stop at nothing to prevent its discovery. Hoping to save himself, Byrd contacts Jonathon Payne and David Jones and begs for their help. The duo rushes to Saint Petersburg, Russia, and quickly finds themselves caught in an adventure that will change their lives forever.