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Major Will Morgan and his elite U.S. Army Counterintelligence team uncover a string of impossible breaches inside America’s most secure defense labs. Every clue points toward a weapon no one admits exists—and a mole no one can identify. From the corridors of Fort Meade to a highly-secured DARPA subcontractor lab, in Maryland, Radiant Sentry races through surveillance traps, Russian sleeper networks, and a quantum-age arms race where one misstep could collapse global command and control. The deeper they dig, the clearer it becomes: the threat isn’t coming—it’s already inside.