Kent Steele Books in Order
Part ofJack Mars Books in OrderSee the Kent Steele / Agent Zero spy thrillers by Jack Mars in order, with summaries, series background, and advice on where to begin this amnesia‑laced espionage saga.
Last updated: December 21, 2025
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Publication Order
25 books
Trigger Zero
by Jack Mars
2026
An experimental weapon system is about to be field‑tested in a live environment. Agent Zero must find and disable the trigger—whether it’s a device or a person—before the test becomes an irreversible act of war.
Redemption Zero
by Jack Mars
2026
Haunted by those he couldn’t save, Kent Steele seizes a chance at redemption when a familiar enemy resurfaces. To end the threat, he’ll have to confront both his past sins and the people who profited from them.
Phantom Zero
by Jack Mars
2026
Rumors spread of a ghost operator completing impossible missions that reshape the battlefield. As the legend of “Phantom Zero” grows, Kent Steele must determine whether he’s chasing an enemy, a myth, or a weaponized story.
Mission Zero
by Jack Mars
2026
Given a mission that officially doesn’t exist, Agent Zero heads into hostile territory with almost no support. Success could prevent a war; failure will simply be erased, along with everyone involved.
Justice Zero
by Jack Mars
2026
In a final reckoning, Agent Zero faces the architects of the program that created him. To secure justice—for himself, his family, and countless victims—he must bring down the system that turned him into a weapon.
Judgment Zero
by Jack Mars
2026
A clandestine tribunal moves to pass final judgment on Agent Zero, using his own past missions as evidence. While they deliberate, Kent Steele races to stop a new plot that proves he’s still the only one who can do the job.
Countdown Zero
by Jack Mars
2026
With a hard deadline looming for a catastrophic attack, Agent Zero races through a maze of decoys and half‑truths. Every lead he chases could be the key—or a diversion designed to run out the clock.
Shadow Zero
by Jack Mars
2025
A mysterious copycat operative begins striking under Agent Zero’s name, leaving bodies and questions in his wake. Kent Steele must hunt the impostor while proving he isn’t behind the new wave of violence.
Rogue Zero
by Jack Mars
2025
Branded a liability after a mission goes sideways, Agent Zero finds himself on the run from his own side. To clear his name, he has to expose the real traitors while thwarting an attack no one believes is coming.
Fractured Zero
by Jack Mars
2025
As fresh trauma fractures Kent Steele’s fragile recovery, his enemies move to exploit the break. Trying to keep his personal life intact, he must still stop a terror cell intent on capitalizing on the chaos.
Enigma Zero
by Jack Mars
2025
A baffling series of strikes leaves no clear pattern, only a signature tied to Agent Zero’s lost years. Kent Steele digs into the enigma, knowing the answers may destroy whatever peace he’s managed to build.
Command Zero
by Jack Mars
2025
A rogue element seizes partial control of Western intelligence assets, turning them toward an unknown objective. Agent Zero has to reclaim the chain of command—or break it—before those resources are used to launch an untraceable attack.
Zero Zero
by Jack Mars
2021
Seeking treatment in Switzerland for his deteriorating health, Agent Zero encounters another operative implanted with a similar false identity—this one tasked with killing him. To survive, he must uncover who created his double and what secrets the man carries.
Absolute Zero
by Jack Mars
2021
As his long war against terror and memory manipulation nears a breaking point, Agent Zero faces one final, all‑or‑nothing confrontation. With his family and country in the balance, Kent Steele has to decide what part of himself he’s willing to lose forever.
Vengeance Zero
by Jack Mars
2020
Enemies from Agent Zero’s fragmented past strike back, targeting those closest to him. As terrorist cells coordinate a wave of attacks, Kent Steele must decide how far he will go—and what he is willing to sacrifice—to settle old scores and save his family.
Decoy Zero
by Jack Mars
2020
A prototype railgun capable of firing an unstoppable projectile falls into the wrong hands. Agent Zero must trace the weapon’s origin and intended target, even as a disturbing turn in his medical condition threatens to sideline him for good.
Chasing Zero
by Jack Mars
2020
Peace talks in the Middle East put the U.S. president in the crosshairs. Agent Zero advises against the trip, then scrambles to protect the motorcade when everything goes wrong, racing through a deadly forty‑eight hours to prevent an assassination and regional war.
An Agent Zero Short Story
by Jack Mars
2020
Set between novels, this short adventure shows Agent Zero grappling with a smaller but still deadly mission. A brief glimpse into Kent Steele’s world, it highlights the constant danger that shadows even his “quiet” days.
Trapping Zero
by Jack Mars
2019
A new terror cell emerges as Kent Steele struggles to piece together who turned him into Agent Zero. Racing from safe houses to embassies, he must spring a trap on the masterminds behind a catastrophic plot—and on those inside the agency who want him silenced.
Target Zero
by Jack Mars
2019
Barely back to normal life, Kent Steele is pulled into another mission: track a biological weapon before it’s unleashed. As memory fragments return and assassins close in, he fights to stop global devastation while protecting his daughters from the world he once served.
Recall Zero
by Jack Mars
2019
An experimental treatment offers Kent Steele a chance to recover more of his lost memories, but it also makes him a target. As terrorists move to exploit his fragile state, he must decide how much of his past he’s willing to reclaim to stop them.
Hunting Zero
by Jack Mars
2019
When Kent Steele’s teenage daughters are kidnapped and funneled toward a European trafficking ring, he ignores CIA orders to stand down. Alone and outgunned, he tears across borders to hunt their captors and dismantle the network before they vanish forever.
File Zero
by Jack Mars
2019
A long‑buried dossier surfaces that could explain Agent Zero’s origins—and expose a conspiracy inside Western intelligence. Kent Steele chases the file across Europe, knowing that whoever gets to it first will control both his future and an imminent terror threat.
Assassin Zero
by Jack Mars
2019
When a legendary assassin surfaces with ties to Agent Zero’s missing years, Kent Steele is drawn into a deadly mirror game. To stop a series of high‑profile killings, he has to confront the version of himself he might once have been.
Agent Zero
by Jack Mars
2019
Kent Steele, a Columbia history professor and single father, is abducted by terrorists who insist he is Agent Zero, the CIA’s deadliest operative. Hunted by enemies and the agency alike, he must uncover his erased past while stopping a looming attack.
Series background & context
The Kent Steele books—also known as the Agent Zero series—center on a single disorienting premise: what if the most dangerous spy in the world woke up one day with no memory of who he really was? Kent Steele appears, at first, to be a quiet professor of European history living with his two teenage daughters in the suburbs. His life unravels the night he’s abducted by terrorists who insist he is Agent Zero, a legendary CIA operative.
From that moment, nothing is simple. As laid out in Agent Zero, Kent is hunted by terrorists, shadowed by the CIA, and stalked by an assassin who seems to know more about his past than he does. Flashbacks, headaches, and reflexive combat skills suggest there is truth buried in their accusations. Each new memory fragment raises a question: did Kent volunteer for whatever turned him into Agent Zero, or was he used?
The series follows him across Europe and back to the United States as he chases terror plots while trying to shield his daughters from the world that keeps dragging him back in. Early books pit him against biological weapons, trafficking rings, and conspiracies inside the very agencies that claim to control him. Later installments widen the canvas with experimental weapons, geopolitical peace negotiations, and enemies who seem to know the limits of his failing body better than he does.
A big part of the appeal here is balance. Kent is both an elite operative and a single parent; missions are threaded between school runs, late‑night phone calls, and the constant fear that his double life will destroy the only family he remembers. Allies and handlers are never fully trustworthy, and even his romantic relationships are clouded by the question of how much he can reveal.
Stylistically, the Agent Zero books move quickly, with a mix of close‑quarters action, spy‑craft, and puzzle‑box plotting around Kent’s lost years. As the series progresses, we learn more about how his memory was tampered with, who benefits from his confusion, and what he was trying to stop before it all went dark.
For readers, the result is a long, serialized story about identity as much as about terrorism: a man trying to decide which parts of his past to reclaim and which to leave buried, even as new threats demand every skill he has left.
Edited by
Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.
Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.









































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