

The Extinction Cycle
5 books
Here are 5 books from The Extinction Cycle series by Nicholas Sansbury Smith. Start with Extinction Horizon (2014), then read the rest in the order below. Books without a series number are listed in publication order.
Books in order

Extinction Horizon
Nicholas Sansbury Smith
When a top-secret Medical Corps research facility goes dark, Master Sergeant Reed Beckham and his elite Delta Force unit, Team Ghost, are sent to uncover what happened and secure critical research. They soon confront a terrifyingly lethal Ebola variant and a rapidly escalating threat that could push civilization toward collapse. Blending real-world science, military precision, and relentless action, the novel follows the team’s desperate race to gather the resources Dr. Kate needs before the outbreak spreads beyond control. It is a tense exploration of survival, sacrifice, and the terrifying consequences of biological warfare.
Extinction Edge
Nicholas Sansbury Smith
After a top-secret medical research facility falls silent, Master Sergeant Reed Beckham and his Delta Force team are sent to investigate a deadly contagion unlike anything they have faced before. The virus transforms its victims into violent monsters, and as the infection spreads through a collapsing nation, Beckham must protect CDC virologist Dr. Kate Lovato while racing to uncover the truth behind the outbreak. Blending military action, biological horror, and post-apocalyptic survival, the novel delivers a relentless, fast-paced thriller filled with danger, reversals, and impossible choices. At the heart of the crisis lies a terrifying question: can humanity be saved before the cure becomes an even greater threat?
Extinction Age
Nicholas Sansbury Smith
When a top-secret medical facility goes dark, Master Sergeant Reed Beckham and his elite Delta Force team are sent to investigate—only to confront a terrifying mutation of the Ebola virus that transforms its victims into monsters. As the outbreak spreads and cities descend into chaos, Beckham must protect CDC virologist Dr. Kate Lovato while she races to uncover a cure. Blending military action, biological horror, and post-apocalyptic suspense, the novel explores survival, sacrifice, scientific responsibility, and the terrifying cost of humanity’s fight against extinction.

Extinction War
Nicholas Sansbury Smith
When a top-secret medical research facility goes dark, Master Sergeant Reed Beckham and his elite Delta Force team are sent to investigate—only to encounter a terrifying Ebola variant that transforms its victims into violent monsters. As the contagion spreads and cities collapse, Beckham must protect CDC virologist Dr. Kate Lovato while she races to uncover a cure amid military chaos, fear, and betrayal. Fast-paced and relentlessly tense, this apocalyptic thriller explores survival, sacrifice, loyalty, and the devastating choices people make when civilization is on the brink of extinction.
Extinction Evolution
Nicholas Sansbury Smith
When a top-secret medical research facility goes dark, Master Sergeant Reed Beckham and his elite Delta Force team, Ghost, are sent to investigate—and confront a terrifying new strain of Ebola that transforms its victims into monsters. As the virus spreads and cities collapse, Beckham must protect CDC virologist Dr. Kate Lovato while the world descends into a deadly new kind of war. Together, they race to uncover the truth behind the outbreak and develop a cure before humanity faces extinction. This fast-paced post-apocalyptic thriller explores survival, sacrifice, scientific ambition, and the dangerous consequences of evolution gone awry.