The Hard Line by Mark Greaney

Published by Berkley on February 17, 2026

In the delightfully over-the-top Midnight Black, Court Gentry needs to get smuggled into Russia so he can rescue Zoya Zakharova from prison. An early action scene in that novel has Gentry in Bulgaria, where his attempt to arrange transportation into Russia goes awry. Gentry kills a bunch of criminals and seriously wounds a hired bodyguard.

Early in The Hard Line, that scene is replayed, this time focusing on the bodyguard, an Irish lad named Charlie Coyle. A few days after Gentry shoots him, Coyle dies from an infection in a Bulgarian hospital. Diedre, Coyle’s wife, delivers that news to Charlie Coyle’s father, Campbell Coyle, who is living in Ireland under an alias.

Campbell was a “bad man with a dark history, and he came from a long line of men with dark histories.” Dierdre blames Campbell for her husband’s death because Charlie, despite being a good man, wanted to be like his father. Campbell blames himself for the same reason.

From the moment he hears the news, Campbell — formerly an assassin-for-hire — makes it his mission to murder the man who killed his son. Campbell is motivated not so much by revenge, but by his desire to assure that his grandson doesn’t get killed while seeking vengeance against his father’s killer.

Gentry has made enemies of almost everyone during the course of the Gray Man novels. Add Campbell to a list that also includes Scott Kincaid, code name Lancer, a “former Navy SEAL turned assassin” who correctly blames Gentry for his confinement in a Cuban prison. Kincaid gets his shot at vengeance in The Hard Line, but he’ll have to find Gentry before Campbell can reach him.

Coyle and Kincaid are among the killers who have been hired by Marcus Maragos, a broker of assassins. Their targets are members of (or affiliated with) the intelligence community. The killers are teamed with support agents from the Gauntlet Group, one of those businesses that make money by renting mercenaries to governments that want to kill people without taking responsibility for the deaths.

Gentry is settling into his role as an operative for a new off-the-books group managed by Matt Hanley. Gentry’s first mission is to extract a CIA asset from Nicaragua whose cover has been burned. While he’s in that country, Gentry learns that China is “working with Nicaraguan intelligence and a Central American drug gang, and clearly involved in a kinetic operation to kill CIA assets.” Exactly who is masterminding that operation in the US, and why recent CIA missions have been compromised, is for Gentry (and the reader) to discover as the novel progresses.

Mark Greaney’s smooth prose contributes to some of the best action scenes in the subgenre of tough guy thrillers. The story is genuinely exciting. Greaney earns extra credit, however, for character development. The most interesting chapter relates a telephone conversation between Gentry and Campbell. As Campbell explains why he needs to kill Gentry, they discuss their family members who lived productive, law-abiding lives and ponder why their isolated lives turned out as they did. Campbell opines that some of their bloodlines are “soft” in a good way, but “You and me. We’re from the hard lines.” Gentry suggests that they could both have chosen different lives, but it isn’t clear that he believes his own argument.

Greaney also explores family and isolation from the perspective of Zach Hightower, whose ex-wife and daughter are in witness protection in Boulder. Zach has tracked them down and, while rehabbing from his injuries, makes daily visits to the coffee shop where his daughter works. The daughter has no idea that Zach is her father. The shop owner wonders if he is a stalker, given the interest he seems to be taking in a teenage barista, while Zach wonders about the life he could have had if he had not chosen one of violence.

Having introduced Zach’s daughter into the story, savvy thriller fans will expect her to be endangered by the bad guys at some point. Those fans will not be disappointed.

To keep the family theme flowing, Gentry needs to convince his dad to shelter somewhere other than Florida so Campbell can’t use him as leverage. Since Gentry hasn’t talked to his father in twenty years, their reunion is touching in a subtle way. Neither Gentry nor his dad are touchy-feely — his dad taught Gentry to shoot and has retained some marksmanship skill that he will eventually put to use in an action scene — but Gentry’s time with his father provides insight into the evolution of a tough guy action hero.

The story’s resolution is enjoyable. Even without the bonus of character development, I would recommend The Hard Line as an action novel. Because it is more than an action novel, I can recommend The Hard Line as one of the best entries in one of the best series in the realm of tough guy fiction.

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Midnight Black by Mark Greaney

Published by ‎ Berkley on February 18, 2025

Readers who have followed the Courtland Gentry novels know that Gentry was a CIA assassin before he became an independent contractor. Since then, when the CIA isn’t trying to kill Gentry, it sometimes hires him to do a job.

At the end of the last novel, Gentry’s lover was captured by Chinese agents. Zoya Zakharova was a Russian agent before she defected and starting shagging Gentry. China barters her to Russia, where she spends some time in a Moscow prison before being transferred to an isolated woman’s labor camp in Mordovia. Also housed in that camp is Nadia Yarovaya, the wife of Natan Yarovoy, who is housed in a men’s prison a few kilometers down the road. Yarovoy is a surrogate for Alexei Navalny, a popular dissident who might threaten the Russian president’s tenure if he were to run in an election. The president is Vitaly Peskov, a surrogate of Vladimir Putin.

The CIA is confident that Zoya was executed, but Gentry believes she’s alive. Gentry intends to find a way into Russia so he can rescue Zoya. Each Gray Man novel sends Gentry on a more unlikely mission than the last, but I have to admire Mark Greaney’s ability to make them seem plausible. Or perhaps I get so caught up in the action that I just don’t care about the plot’s unlikely nature.

The novel begins with Gentry causing mayhem in Bulgaria and Romania as he tries to get smuggled into Russia. By the time he makes a plan that succeeds, Gentry has the support of his old boss, the former deputy director for operations at the CIA, Matthew Hanley. Thanks to his past involvement with Gentry, Hanley is now the deputy station chief in Columbia. The new DDO, Trey Watkins, put him there.

The coincidence of Gentry heading to a prison near the one that holds Yarovoy is too good for Watkins to pass up. Hanley persuades him to use Gentry as an asset and to enlist the military support of Ukraine in an attempt to liberate Yarovoy from one prison and his wife from the other. Much of the fighting will be done by an armed organization of Russian dissidents that is funded by an oligarch who would like to see a regime change. Watkins turns to series regular Zach Hightower (who is serving a relaxed confinement in a CIA safe house) to train a Russian assault team.

With that background, the story should almost write itself in the reader’s mind. Fortunately, Greaney did the writing instead, assuring that the reader will be treated to an escalating series of action scenes, culminating in military assaults on two prisons, pitched battles between Russian dissidents and FSB agents, chases, shootouts, explosions, daring escapes, and all the fun of a James Bond movie. Few writers can pull off such an ambitious plot, but Greaney never gives the reader time to question Gentry’s ability to survive while killing dozens of bad guys.

An interesting subplot pits the FSB, the GRU, and the SVR against each other. Another follows Zoya as she attempts to escape before realizing that she’s being played.

Greaney builds suspense through relentless action. That the reader will be confident of a favorable outcome never makes the story less exciting. The moving parts are described in such detail that the reader might feel like a participant in the final assault. Midnight Black is another fine entry in a thriller series that never disappoints. It might, in fact, be the best Gray Man novel to date.

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Sentinel by Mark Greaney

Published by Berkley on June 25, 2024

I give Mark Greaney credit for writing some of the best action scenes in the thriller industry. Still, I’m a bigger fan of his Gray Man series than his Armored books. The Gray Man is antisocial, justifiably paranoid, and a bit of an asshole. That’s why I like him. Josh Duffy is friendly, likable, dependable, and has as much personality as a GI Joe action figure. The only trait that makes him seem human is his PTSD, and that only manifests itself in nightmares that have no impact on his work. He’s too boring to make me look forward to his next adventure.

Duffy works for the State Department’s Bureau of Diplomatic Security. His wife is a State Department Political Officer. They begin the novel in Washington D.C., where Duffy protects a European Union official when a riot breaks out at a protest attended by her daughter.

Duffy and his wife are then jointly assigned to the U.S. Embassy in Ghana. They get to take their kids because Ghana is a relatively stable democracy so what could go wrong? Duffy expects the assignment to be dull, but a Chinese intelligence officer is working to orchestrate a coup that will increase China’s influence in western Africa. The agent has enlisted the services of a South African mercenary who once worked with (and was despised by) Duffy. They were employed as “private security,” a polite term for mercenaries, in Afghanistan and Syria.

The South African in turn enlists the services of Russian mercenaries who work for Wagner. The Chinese agent has also recruited rabble rousers from Togo and other surrounding nations. Unbeknownst to the South African, the Chinese agent also employs Islamic terrorists, with whom the South African would not ordinarily work. It’s good to know that people who overthrow democracies have principles.

Duffy is assigned to a team protecting the US ambassador during a trip with Ghana’s president and a UN representative as they make political appearances in Ghana. Duffy's wife is part of the diplomatic team because of course she is. The trip takes them to a hydroelectric dam that the South African has just captured in stage one of the coup. Bad weather causes them to arrive a day early, upsetting the coup timetable. Shootouts and explosions ensue.

From that point onward, the novel is a series of action scenes, primarily involving Duffy and a Ghanian cop as they try to keep the dam from being blown up while protecting diplomats and Duffy's wife. They also need to prevent the South African from recovering a laptop computer that would provide embarrassing evidence of Chinese involvement in the coup.

The novel's credible atmosphere is obviously the product of meticulous research. The action is fast but perhaps a bit too predictable. When, for example, the South African kidnaps Duffy’s kids (thriller fans will see that coming from the second they learn the kids are traveling to Ghana), Duffy’s plucky daughter displays the kind of bravery that triller fans are used to seeing from the children of action heroes. While the story holds no surprises, it generates excitement through constant motion. I can easily recommend it to action novel fans, but Sentinel lacks the spark that Greany brings to his Gray Man novels.

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The Chaos Agent by Mark Greaney

Published by Berkley on February 20, 2024

While Gray Man novels are about action, not deep thought, The Chaos Agent might be seen as a cautionary tale about the consequences of misusing Artificial Intelligence — specifically, by creating autonomous weapons that are guided by an AI. The concept of autonomous AI weaponry has been familiar to fans of science fiction novels and Terminator movies for decades, but The Chaos Agent offers a credible and timely look at how AI killing machines might threaten the world at a time when political leaders are asking whether it would be wise to regulate AI technology.

Granted, most of the concern about AI has involved pranksters creating deepfake videos and students using ChatGPT to write term papers. Autonomous weapons — machines that make their own decisions about when and how to engage in battles — could pose a greater existential threat than most other unfortunate uses of AI.

Court Gentry, aka Violator, aka the Gray Man, is traveling in South America with his dangerous lover Zoya Zakharova. They’re trying to stay under the radar of the many people who want to kill them. That plan is thwarted by a drone that happens to be watching a Russian who is watching Zoya. The Russian wants Zoya’s help to exfiltrate an agent in Mexico who has information about autonomous weapons. Zoya would like to help but Court wants none of it. He is nevertheless sucked into danger when the drone sends his picture to a bad guy who identifies him as a target.

More immediate targets are scientists and engineers who are being killed in countries around the world. Different intelligence agencies have different theories about how they are connected. Their connection to weaponized AI will be apparent to the reader, but why they need to be assassinated is less obvious.

One threat leads to another as Gentry is targeted by a former CIA assassin. After a series of action scenes, Gentry agrees to help the CIA get to the bottom of the murders and to thwart the risk of giving a tactical advantage to whichever nation is the first to develop autonomous weaponry. Machines that fight on their own initiative are faster and deadlier than humans operating weapons. As science fiction and thriller fans know, an AI that can train itself to adapt to changing battlefield conditions will eventually decide that the best tactic to assure its own survival is the eradication of all humanity. Gentry decides it might be wise to prevent that from happening.

One of the scientists who has been targeted is Anton Hinton. He has a lab in Cuba and a strong security team, but he strengthens the team by hiring Zack Hightower. Series fans will recognize Hightower as a former CIA paramilitary guy who once worked with, and later worked against, Gentry. Hightower and Gentry are fated to reunite in Cuba.

The plot is intelligent, although it is largely an excuse for action scenes. That isn’t a complaint. Shootouts, explosions, chases, crashing trucks through fences, all the good stuff that looks cool in movies is just as fun on paper, given Mark Greaney’s cinematic writing style. Greaney is one of the best action writers in the business.

Gray Man novels are a cut above most tough guy action novels because the plots are tight, intelligent, and surprisingly credible. And if a plot element might not be credible, Greaney makes the storyline seem plausible in the moment, even when Gentry is shooting at four-legged war machines that would be at home in a Star Wars movie. The Chaos Agent is an entertaining action story, but if it makes people think about the risks of using AI as a weapon, the novel will have served a higher purpose.

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Burner by Mark Greaney

Published by ‎ Berkley on February 21, 2023

A UN summit in New York will finalize an agreement between the West and Russia to restore Russia’s most favored nation status in exchange for Russia’s agreement to end its war with Ukraine. While Ukraine is not a party to the agreement and will likely fight on its own to regain its lost territory, the agreement does not require Russia to restore the land it seized. This is a bad deal for Ukraine, but the West wants Russian oil and gas. I can understand that premise, but when he plotted Burner, Mark Greaney probably didn’t know that western nations would get by just fine without Russian oil. Maybe the novel’s prediction will still come true, but those who hope for justice in Ukraine will be outraged if it does.

Court Gentry is certain that nobody in power cares about outrage against injustice. Power invites the kind of corruption that has always plagued Gentry, both during and after his tenure with the CIA. Gentry is still subject to a CIA kill order. His current CIA nemesis, Suzanne Brewer, pauses the longstanding order whenever she needs Gentry’s services. She sends a desk jockey, Angela Lacy, to meet with Gentry after tracking him to his boat in the Caribbean, where Gentry is fulfilling a contract from a wealthy Ukrainian to sink yachts owned by Russian oligarchs. Angela has no idea that man she’s meeting is the Gray Man.

A Russian who handles financial transactions for Russian spy agencies has copied those transactions to a phone. Having had his fill of Russian deviltry, the Russian gives the phone to the Swiss banker who processed those transactions. By matching the data in the phone to the bank records, a smart forensic accountant will be able to trace payment recipients in western nations who are taking bribes from Russians. It turns out that their numbers are plentiful. Naturally, those folk want to stop the banker before the records are made public.

The Swiss banker, Alex Velesky, is a Ukrainian who has no love for Russia. He sends the bank records to the cloud and plans to deliver the password and the phone to Ezra Altman, a forensic accountant employed by DOJ who has spent years building a database of suspicious Russian financial transactions.

Velesky must overcome several obstacles. First, Brewer has hired Gentry to recover the phone after telling Gentry that the phone includes evidence of CIA financial transaction in Russia that, if exposed, would place CIA operatives in danger and imperil national security. Second, Zoya Zakharova has been hired by a rival bank (or so she thinks) to recover the phone so that the bank can use the data to poach some of Russia’s banking business. Third, the Russians have tumbled to Velesky’s plan and have sent their best man to recover the phone.

Series fans will recall that Gentry and Zoya have a thing going on. They’ve both been deceived about the nature and purpose of their missions and, naturally enough, they will eventually stop fighting each other and start fighting together. The fighting includes the stuff from which thrillers are made — gun battles, knife fights, jumps between rooftops, even the overused crawl across the top of a train car while the train is in motion. Thankfully, there isn’t a ridiculous fistfight on top of the train, as Greaney avoids crossing the line that separates improbable realism and impossible movie stunts.

While Burner is fundamentally an action novel, Zoya’s alcoholism and substance abuse (and Gentry’s fears and frustration with Zoya’s addictions) add depth to the characters. Greaney sets up Lacy to play a courageous role despite Zoya’s skepticism that she has what it takes. He also sets up an ending that demands sacrifice in the name of principle — the kind of principles for which Russians and their corrupt counterparts in the US and Europe have no use. All of that makes Burner a saccharin-free “feel good” story, although a fair amount of indiscriminate death precedes the relatively happy outcome.

Greaney is one of the best action thriller writers in the business and, unlike too many novelists who write about tough guys, he doesn’t depend on divisive politics and gun worship to attract an audience. Series fans won’t be disappointed, while new readers can easily enjoy Burner without reading all the Gray Man novels that precede it.

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