book cover of Threshold State
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Threshold State

(2026)
(The first book in the Zac Johnson series)
A novel by

 
 
Theo discovers someone is manipulating an implant inside his skull. Before he can expose them, he's dead.

Celine Mendoza, candidate for Vice President of the United States, secretly receives a more advanced version of the device. It works. Her hearing returns. Her memory sharpens. Problems that once took hours solve in minutes.

Then ideas stop feeling like hers.

Conclusions arrive fully formed—in a voice she mistakes for her own. She makes decisions she can't explain. And the evidence points somewhere impossible:

The implant isn't simply enhancing her mind.

Someone can talk to it.

Her party wins the election. Two weeks later, the President-elect dies—now the woman implanted with the most advanced brain-computer interface ever built is nine weeks from the Oval Office.

Former Army Ranger turned scientist Zac Johnson traces the sabotage to altered firmware, buried data, and the one engineer alive who built what's inside Celine's head.

Then he vanishes.
And it's not just the Americans hunting him.

From Silicon Valley and Washington to the Himalayas and the streets of Istanbul, Zac races to find the engineer. Because whoever finds him first controls the device—and whoever controls the device controls the President of the United States. What she believes. What she decides. What she does.

How do you protect a president from an enemy that's already inside her head?


Genre: Thriller

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