A dead drop in a quiet Maryland park. A Russian orbital test that cripples a satellite. And somewhere inside America’s most advanced defense project… a traitor.

Major Will Morgan and Team Watchtower—an elite Army counterintelligence unit—are sent deep inside a DARPA subcontractor to hunt a mole leaking secrets about Radiant Sentry, a revolutionary orbital defense system capable of redefining space warfare. If the program falls, America’s satellites—and its military command structure—could go dark in a single, devastating strike.

What begins as a controlled investigation spirals into a shadow war spanning Fort Meade, Moscow, and the edge of Earth’s atmosphere. Russian intelligence unleashes disinformation campaigns, assassinations, and illegal networks on U.S. soil. An AI surveillance system named SYBIL can see patterns no human can—but it can’t read motives. And as false leads multiply and loyalties fracture, Will must decide what to trust: the machine, his instincts, or the people closest to him.

When an adversary anti-satellite test triggers a Black Sky alert and global tensions ignite, the mole hunt becomes a race to prevent orbital catastrophe. The battlefield is no longer just in the shadows—it’s in space.

In a world where secrets are weapons and truth is expendable, victory demands more than technology. It demands sacrifice.

Perfect for fans of high-stakes military thrillers and cutting-edge techno-espionage, Radiant Sentry delivers relentless tension, authentic tradecraft, and a chillingly plausible glimpse into the next war—one fought above our heads.