S.D. Tanner Books in Order

Gears considers a dangerous solution to the infection threatening humanity, offering survivors a way to fight back. An unexpected action by Mackenzie forces him to reconsider his assumptions as the brothers confront the cost of survival.

Three Army brothers find their military lives upended by an apocalypse that unleashes the undead. As they establish refuges and gather survivors, Gears, Pax, and TL must confront threats from both the living and the dead.

Searching for fertile land and a safer future, the survivors move toward the coast. New questions about Ip and the Devil complicate their journey, while Ted's mistake leaves Gears facing another threat to their fragile community.

With survivors gathering at their bases, the brothers discover that apparent safety can conceal new dangers. Pax's mistake puts Ip at risk, while Gears struggles to protect their community against enemies operating within its boundaries.

Events that should be impossible reveal that the Devil's power exceeds the brothers' expectations. Gears prepares for a decisive conflict as humanity faces the prospect of losing its freedom for a thousand years if it fails.

The hunters return changed, and Gears, Pax, and TL investigate what has happened in Eden. Uncovering a ruler's deception forces Gears to rethink his strategy as the brothers face another struggle to save America.

Five years after the Devil's defeat, peace in Eden begins to unravel. The returning Horsemen bring new concerns, America turns against itself, and Gears takes on a mission against a ruler whose intentions remain dangerous.

Hunger spreads as the land deteriorates, forcing Gears to assert his authority over the survivors. The Devil continues to maneuver against them, and Ted faces a difficult choice as the brothers struggle to preserve their people.

Scientists discover how to extend human life by five centuries, opening dangerous possibilities for biological warfare. Former Army intelligence officer Jack Locke investigates a genetic conflict that could determine the future of the species and redefine humanity itself.

Leon and Ark train a new Navigator squad for field operations while Bill's weapons engineers confront technical challenges. Meanwhile, medical researchers study alien organisms, searching for an advantage that could help humanity resist the invasion.

The alien enemy pushes Ark beyond restraint, prompting an all-out response in humanity's struggle to survive. With enhanced Navigator soldiers central to the resistance, the conflict reaches the point where holding back no longer seems possible.

Pax grows disillusioned with human cruelty while the Horsemen argue over their future. Gears, Pax, and TL travel into Heaven in search of Ip, drawing them toward a confrontation with the Ruler and questions about their purpose.

Recalled from a war zone after narrowly escaping execution, Staff Sergeant Leon Shield returns to a country already defeated. A new species has seized the world without firing a shot, leaving humanity searching for a way to resist.

Human survivors develop their own answer to alien abilities as new forces join the resistance. First contact brings fresh possibilities, but Ark fears they are heading toward failure and must decide which losses the fight can bear.

After moving back to America with her husband, Serena rents an old country property where unexplained events begin unsettling her. An encounter with a Ouija board draws her into a mystery that makes her question her own sanity.

Jace and his companions begin establishing their Martian colony, only to discover they are not alone. With Apollo already pursuing his own plans, the settlers must determine who will control their new home and humanity's future.

Aboard the first ship to Mars, Jace and an inexperienced crew prepare an underground refuge while Earth continues to deteriorate. Suspicions about the disaster's cause complicate a mission already burdened by limited resources and vulnerable passengers.

As sudden environmental catastrophe devastates Earth, Colorado rancher Jace struggles to protect his livelihood and survive with his dog. A billionaire's offer of passage to Mars presents an uncertain escape from a rapidly dying world.

The struggle for humanity's survival becomes a conflict across two planets. Jace and his allies confront Apollo as people are called to take sides in a final contest over the place humans will occupy in the universe.