Books by O. T. Riesen
Zombie Girl Omega Series
Are we human, or are we the monsters?
Book One: Initiation
Shaped by the same virus that has consumed their world, the Zeta soldiers are as feared and rejected as their enemy. Their existence is solitary, plagued by an unending war with a mindless enemy that feeds on the flesh of those they are sworn to protect. It is a carnal and deadly existence, filled with marauders, zealots, and the mindless, cannibalistic Zee.
Sergeant Omega and her elite team of highly volatile soldiers must rely on each other’s unique abilities to be victorious and to survive. Only by doing so can they hope to reclaim humankind from the threshold of oblivion.
They are the pinnacle of humanity’s achievement and the brink of its failure. How far will they go before death erases the thin line that separates them from the monsters?
Fight until the mission is done. No relief. No surrender. They are the Zeta soldiers, and she is Omega.
Book Two: Contention
The American Southwest has become a raw and treacherous wasteland where survival depends on more than just avoiding the flesh-eating Zee. Sergeant Omega has fought hard to prove that Beta squad deserves the same respect as the elite units, but her disdain for the arrogant Alpha soldiers runs bone-deep, especially when they treat her team like second-class fighters.
When she’s ordered to lead her volatile team on a mission to deliver the legendary warrior Tau home, Omega expects resistance from the wasteland—not from her own charge. Tau’s refusal to respect her command and follow orders doesn’t just undermine her authority—it endangers every life under her protection. As tensions within the squad reach a breaking point, they must navigate not only the hordes of ravenous Zee but also mysterious religious zealots who seem unnaturally interested in the Zeta soldiers.
In a world where trust is a luxury and mistakes are fatal, both rescued and rescuers must overcome their prejudices and learn to fight as one. Because in the wasteland, unity isn’t just about completing the mission—it’s about making it out alive.
Book Three: Insurrection
When loyalty becomes the deadliest weapon, who can you trust?
Omega has survived the Zee plague, brutal combat, and the chaos of a crumbling world. But when her squad suffers casualties and their position keeps getting compromised, she can’t shake the feeling that the enemy isn’t only outside the wire — and that instinct may be the most dangerous thing she’s ever trusted.
With desperate refugees depending on her team for protection and an immune survivor known only as La Madre who could hold the key to ending the plague, Omega is running out of time — and options. The hunt for answers only deepens the uncertainty: about what the United Forces truly wants with the cure, about whether that cure even exists, and about who among her own ranks she can still believe.
As enemy forces close in and the conspiracy unravels from the inside out, Omega must decide who deserves her loyalty before it costs her everything. Some enemies wear uniforms. Some battles can’t be won without sacrifice. And some truths, once known, can’t be survived intact.
Book Three of the Zeta Wars. Reading order matters — begin with Initiation.
Book Four: Defection
At what point does loyalty become complicity?
Omega has spent her life serving the United Forces — bleeding for them, killing for them, asking few questions because the mission demanded none. But with the immune survivor finally in her squad’s care, betrayals carved fresh in her team, and cracks widening in the institution she’s sworn to defend, the questions she can no longer push down may be the most dangerous weapon in the wasteland.
When the UF recalls them to HQ for debrief, Omega knows the answers she needs are inside those walls — and so are the people who would kill to keep them buried. The cost of asking may be more than her command. It may be her life.
In a world where the institution may be the architect of the apocalypse it claims to fight, defection isn’t betrayal. It’s the only honest mission left.