Dr. Victor Kraus labored tirelessly as a wildlife ecologist, passionately striving to use science and reformed policies to curtail the human activities driving global warming and fueling the sixth mass extinction. When Victor realized that nothing would stop the number of species being lost to human greed and overconsumption, he resorted to using the only weapon left in his arsenal: the first mass human extinction. A highly lethal engineered virus was developed and disseminated around the world to reduce the human population to one billion people. As the viral apocalypse detonated across the globe, the virus destroyed billions of lives and delivered fear and chaos to every corner of the earth. With the pandemic running rampant, a Montana virologist working on a vaccine, recruited an unlikely group of friends to help him hunt down an increasingly brazen Victor, stop the virus, and save what is left of humankind.