One half the human population destroyed by a permafrost virus. 
One ruthless corporation with a secret knowledge.
One last chance to pull humanity back from the brink. 

The Vostok Virus destroyed the world. Half the world’s population died immediately. A quarter were immune. And a quarter became Ragers: relentless predators stripped of pain, compassion, or humanity—driven only by rage.

As an environmental journalist before the world imploded, Hannah Aldeen knew the chances of a world altering virus were high. She took precautions. Now, In upstate New York, she’s created a sanctuary to keep her family safe. Water, food, energy—her farm is almost perfectly self-sustaining. It’s her little refuge of safety in a world gone mad.

Until the Omega corporation shows up on her doorstep and shatters that safety.

Forced out into an apocalyptic nightmare by a corporation intent on collecting them, Hannah and her children must face a world where danger comes not just from the Omega, not just from the Ragers, but from the other survivors as well.

Figuring out why Omega is after them and keeping her family safe is all that matters to Hannah. But the clock is ticking. And in a world where Omega holds the resources and violence is a way of life, how can she possibly succeed?

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If you loved the viral realism of The Andromeda Strain by Michael Crichton or the genetic intrigue of Pandemic by Daniel Kalla, Extinction Threshold delivers. R.D. Brady fuses scientific plausibility with emotional urgency in a post-collapse world shaped by biotechnological secrets, ethical fault lines, and the drive to protect the future at all costs.

With its blend of emotional depth, breakneck pacing, and survivalist realism, this post-pandemic thriller is a must-read for anyone who wonders what happens when the systems fall—and the only thing left is family.