Deep beneath the ancient city of Jerusalem lies a secret that knows no bounds, devastating enough to reach across time. History’s greatest spy story begins here. For a millennium, Jerusalem’s Temple Mount has been at the center of war and death. There’s never been a time when blood wasn’t spilled upon this ancient, sacred site. Flash forward to present-day Jerusalem, where 35-year-old Israeli counterterrorism agent Sam Deker has just thwarted the most recent act of violence—an attempt by radical Palestinians to blow up the Dome of the Rock mosque and pin the blame on right-wing Orthodox Jews. The threat, however, is a diversion. Deker himself is the real target. He is captured and taken to neighboring Jordan, where he is tortured because of his deep knowledge of Israel’s...