The Zero Horizon

800 FEET DOWN. NO BACKUP. NO WAY OUT.

Drew Marshall and the Ghost Unit have infiltrated fortified bunkers, hacked global networks, and toppled regimes. But they have never faced a kill zone like this.

Deep beneath the Atlantic Ocean lies The Nexus-a Cold War black-site powered by geothermal energy and cooled by the crushing depths of the sea. Inside its titanium walls sits the Spectre Protocol, a weaponized AI capable of predicting-and ending-wars before they begin.

The mission is simple: Dive down, scrub the servers, and destroy the code.

But the ocean is unforgiving, and the enemy is waiting.

When Marshall and his team descend into the abyss, they discover the station isn't a tomb-it's a fortress. And its creator, the mad architect Dr. Julian Voss, hasn't brought them there to destroy his masterpiece. He's brought them to feed it.

As the station's automated defenses wake up, the situation on the surface turns catastrophic. A mercenary fleet led by the ruthless Kestrel group lays siege to the support boat, severing the team's only lifeline to the world above.

The tether is cut. The air is running out. And the water is rising.

Trapped between a freezing flood, an army of maintenance droids, and a sociopath with a god complex, Marshall must make the ultimate choice: Save the data, save the team, or burn it all down to keep the world safe.

In the crush zone, there are no good options-only survival.

Praise for the Third Option Series:

"A masterclass in tension. Thad Cross writes with the technical precision of a coder and the heart of an operator."

"Claustrophobic, explosive, and relentlessly paced. This is 'The Abyss' meets 'Mission: Impossible'."

Perfect for fans of Mark Greaney's The Gray Man, Jack Carr's Terminal List, and the techno-thrillers of Tom Clancy.