Chain Reaction

Buckle up for a ride like no other. The world’s bestselling hero is back in a brand new, high-octane adventure.

‘A piece of pure thriller-writing gold. Chain Reaction demonstrates why the extraordinary Reacher franchise is as popular and enduring as it is.'
LISA JEWELL, No.1 bestselling author of Don't Let Him In


Jack Reacher is hard to find. It's not easy to track him down. And he likes it that way.

But General Susan Turner, based deep inside the Pentagon, has the means and the motive.

She needs his help. A member of her team has been brutally murdered on covert duty. She can’t trust anyone she works with, not even her deputy. She needs someone from the outside. Someone who solves problems and disappears without a trace.

Reacher heads to Summertown, Colorado. A town as remote and bizarre as it gets. One diner, one motel, five massive data centres, two giant solar farms humming away in the dust. Total population: four people. And one of them is watching him.

But Reacher isn’t built to run. He’s built to finish things.

General Turner knows: if they come for him, they'll regret it - all the way to the top of the chain.

*CHAIN REACTION - the brand new Reacher novel, available to pre-order now!*

‘Everything I love about Jack Reacher. Taut, tense, unputdownable . . . Hits like a hammer blow, just like Reacher himself.’
LAURA SHEPHERD-ROBINSON, bestselling author of The Art of a Lie
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PRAISE FOR JACK REACHER:
'The coolest continuing series character' STEPHEN KING
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'Everyone's favourite rebel hero' KARIN SLAUGHTER

And don’t miss Reacher's most recent adventure, No.30, Exit Strategy ***OUT NOW***

Lee Child (Author)
Lee Child is one of the world’s leading thriller writers. He was born in Coventry, raised in Birmingham, and now lives in England's Lake District. It is said one of his novels featuring his hero Jack Reacher is sold somewhere in the world every nine seconds. His books consistently achieve the number-one slot on bestseller lists around the world and have sold nearly two hundred million copies. Lee is the recipient of many awards including Author of the Year at the 2019 British Book Awards. He was appointed CBE in the 2019 Queen's Birthday Honours.

Andrew Child (Author)
Andrew Child is a British thriller novelist. Under the name Andrew Grant, he is the author of nine acclaimed thrillers. Since 2020, he has collaborated with his brother, Lee Child, continuing the legacy of one of the world’s most iconic thriller heroes. He lives on a wildlife preserve in Wyoming with his wife, the novelist Tasha Alexander.

A piece of pure thriller-writing gold. Chain Reaction demonstrates why the extraordinary Reacher franchise is as popular and enduring as it is. ― Lisa Jewell, global bestselling author of NONE OF THIS IS TRUE

Everything I love about Jack Reacher. Taut, tense, unputdownable. From solar farms to Silicon Valley. Hits like a hammer blow, just like Reacher himself. ― Laura Shepherd-Robinson, Sunday Times bestselling author of THE SQUARE OF SEVENS

Chain Reaction by Lee Child and Andrew Child is the thirty-first novel in the Jack Reacher series and a fast-moving thriller built around murder, military intelligence, cybercrime, betrayal, and the relentless pursuit of justice. The novel is scheduled for publication on October 20, 2026, and brings Reacher together with General Susan Turner, a character with whom he has a complicated personal history. The story begins with a covert military murder and gradually expands into a much larger conspiracy involving enormous sums of money, sophisticated data systems, and people operating inside the very institutions that are supposed to protect the country.

At the centre of the story is Jack Reacher himself, the former military policeman who has deliberately built his life around freedom and anonymity. Reacher has no permanent home, no conventional career, and very few possessions. He moves from place to place and generally avoids becoming attached to institutions or people. Yet his military past continues to draw him into situations where his particular combination of intelligence, experience, physical strength, and moral determination becomes valuable. In Chain Reaction, that past catches up with him through General Susan Turner.

Turner is based at the Pentagon and heads a unit connected to the 110th Military Police. She knows Reacher well enough to understand both his abilities and his independence. When one of her people is brutally murdered while working undercover, Turner realizes that she may have a serious problem inside her own organization. She cannot confidently trust the people around her, including her deputy. Instead of relying entirely on official channels, she needs someone from outside the system—someone who can investigate without being controlled by the people who may themselves be compromised. That person is Reacher.

The request is not particularly attractive to Reacher. He has little reason to involve himself in Pentagon politics, and the invitation comes with unanswered questions. Turner does not initially give him the complete picture. She tells him enough to make the case interesting but not enough to remove the uncertainty. Reacher is naturally suspicious, but he is also curious. That curiosity is one of the forces that repeatedly drives him into danger. He agrees to help, setting the novel's central chain of events in motion.

The murdered operative is John Bisley, whose death initially appears to be an isolated killing. But the circumstances surrounding his work indicate that there is much more underneath the surface. Bisley leaves behind a wife and an eleven-month-old daughter named Amanda, and his death consequently has a human cost beyond the immediate crime. Reacher is not simply investigating an anonymous casualty of a covert operation. He is confronted with the consequences that violence has for the people left behind. Publishers Weekly specifically highlights Reacher's unexpected interactions with the baby Amanda as an element that gives the novel unusual emotional depth.

As Reacher begins looking into Bisley's death, the case takes him toward Denver and eventually to the strange, isolated community of Summertown, Colorado. Summertown is unlike a normal small town. It has one diner, one motel, enormous data centres, and large solar farms, while very few people actually live there. The contrast is striking: the town appears almost empty, yet it contains infrastructure of extraordinary scale and importance. The isolation makes it an ideal setting for secrets.

Reacher quickly senses that he is being watched. This is one of the familiar pleasures of a Reacher novel: the protagonist enters an unfamiliar environment and begins noticing details that ordinary observers might ignore. The apparent emptiness of Summertown does not make him feel safe. Instead, it makes him more suspicious. When a place has very few people but contains massive technological infrastructure, every person becomes potentially significant.

The threat becomes immediate when Reacher is attacked by assassins. Their attempt to eliminate him confirms that his investigation has already reached dangerous territory. The attackers are not simply trying to frighten him or persuade him to stop asking questions. They want him dead. As usual, Reacher's response is direct and physical. The people who attack him discover the problem with trying to remove Jack Reacher from an investigation: he is exceptionally difficult to intimidate, and violence against him tends to produce exactly the opposite of the desired result.

The attack also provides an important clue. Someone knows Reacher is investigating. That means the conspiracy is connected to people with access to information about his movements and actions. The danger surrounding him therefore strengthens the suspicion that the original murder is part of something much larger.

One of the novel's major themes is the danger created when technology, money, and secrecy come together. The case involves what the publisher describes as "phantom data centers"—facilities designed to copy information from legitimate data centres. The concept gives the story a distinctly contemporary dimension. Earlier Reacher investigations often revolved around physical objects, military secrets, organized crime, or traditional forms of espionage. Here, information itself becomes the valuable commodity. Data can be copied, moved, concealed, and exploited without being physically removed from the systems that originally contain it.

The financial stakes are enormous. Billions of dollars are connected to the scheme, meaning that the murder of one operative is only one visible part of a much larger operation. The title Chain Reaction becomes appropriate because events are connected: one crime leads to another discovery, which leads to another threat, which exposes another layer of the conspiracy. Reacher is not dealing with a single criminal act but with a network in which each component supports another.

The investigation therefore requires Reacher to combine the instincts he developed as a military policeman with a willingness to understand a modern technological threat. He may prefer simple facts and direct action, but the enemy he faces is operating through systems that are far less visible than the physical world. The contrast between Reacher's old-fashioned investigative instincts and the modern world of data centres gives the story much of its tension.

General Turner becomes increasingly important as the investigation develops. Her relationship with Reacher is complicated by their history. They are not strangers who happen to meet during a case. They have worked together before, and there is a personal connection between them. Their reunion consequently carries an emotional dimension alongside the professional one. Publishers Weekly notes that their old romance begins to re-emerge as they work together in Denver.

This relationship also creates an interesting question for Reacher. He has spent much of his life avoiding permanent attachments. His lifestyle is based on movement and independence. Turner represents something different: a person with whom he shares history, mutual respect, and emotional familiarity. Their renewed relationship does not transform Reacher into an ordinary domestic character, but it gives the story a glimpse of the man behind the legend.

At the same time, Turner has her own difficulties. She is operating inside a military organization where she suspects betrayal. Her authority should theoretically give her access to information and resources, yet that same position makes her vulnerable because she cannot be certain whom she can trust. The novel consequently explores an important thriller theme: institutions can become dangerous when the people inside them are compromised.

Reacher's outsider status becomes his greatest advantage. Because he does not belong to the system, he can ask questions that insiders may be afraid to ask. He does not have a career to protect, a superior officer to impress, or an institutional reputation to maintain. His only concern is discovering the truth and dealing with the people responsible.

That independence also explains why Reacher's methods are so different from those of conventional investigators. He observes carefully, thinks several moves ahead, and is willing to act quickly when he recognizes a threat. He is not reckless for the sake of violence. His physical strength is simply one of the tools available to him. When an opponent crosses a line, Reacher responds with the directness that has become his defining characteristic.

Yet the novel gives him a softer dimension through Amanda, the baby left behind by the murdered operative. His interaction with her creates a striking contrast with the violence surrounding the investigation. Reacher is usually portrayed as a solitary man who needs little from anyone. His willingness to comfort a crying child reveals another side of his personality. He may be emotionally guarded, but he is not emotionally empty. He has a strong instinct to protect people who are vulnerable and have no ability to protect themselves.

The investigation eventually brings Reacher and Turner closer to the people responsible for the conspiracy. The trail leads toward cybercriminals who have been exploiting the data-centre infrastructure and the enormous financial opportunities associated with it. The criminals are dangerous not simply because they can use technology but because they understand how to conceal their activities behind legitimate systems and apparently ordinary businesses. Their operation demonstrates how modern criminal enterprises can hide in plain sight.

This is where the title's idea of a chain reaction becomes especially meaningful. The murder of Bisley is not the beginning of the conspiracy, and Reacher's investigation is not an isolated response. Every action produces another consequence. The people behind the scheme attempt to eliminate witnesses; the murder prompts Reacher's involvement; Reacher's involvement provokes further attacks; those attacks reveal that the conspiracy reaches deeper than initially suspected. The more Reacher pushes, the more the hidden structure begins to reveal itself.

The suspense therefore comes not only from wondering who the criminals are but from understanding how far their influence extends. Reacher must determine which people are genuine allies and which are connected to the conspiracy. The question of trust remains central from beginning to end.

The novel also retains the characteristic Reacher combination of investigation and action. The technological mystery gives the story intellectual complexity, while the physical confrontations provide the explosive moments associated with the series. Reacher may spend time reasoning through evidence, but once he identifies a threat, the pace can change rapidly. His opponents discover that technological sophistication does not protect them from someone willing to confront them directly.

At a deeper level, Chain Reaction explores the tension between systems and individuals. Modern society depends upon enormous networks of information, infrastructure, money, and authority. These systems are powerful precisely because individual people cannot easily see how all their parts connect. Criminals can exploit that complexity. Reacher represents the opposite approach. He reduces complicated situations to basic questions: Who benefits? Who is lying? Who is afraid? Who is trying to stop him? And what happened to the person who was killed?

This human-scale method becomes increasingly valuable as the investigation grows more complicated. Reacher does not need to understand every aspect of the technology to recognize the behaviour of people. Greed, fear, betrayal, and self-preservation remain familiar even when the machinery surrounding them is modern.

Ultimately, Chain Reaction is a story about the consequences of hidden wrongdoing. A covert murder becomes the first visible link in a chain involving military intelligence, compromised loyalties, cybercrime, enormous sums of money, and dangerous attacks. Reacher's involvement causes the chain to accelerate rather than break. Every attempt to stop him gives him another reason to continue.

The emotional dimension of the novel comes from the contrast between Reacher's solitary nature and his growing connection with Turner and Amanda. Turner reminds him of the life he once had within the military, while Amanda represents innocence and vulnerability. Together, these relationships reveal that Reacher's independence is a choice rather than evidence that he lacks the capacity for attachment.

In the end, Chain Reaction remains faithful to the qualities that have defined the Jack Reacher series while placing its hero inside a distinctly modern threat. It combines a murder investigation with military intrigue, cybercrime, enormous financial stakes, physical danger, and personal relationships. The story begins with one murdered operative but expands into a much larger battle over information and power.

Most importantly, the novel reinforces the central idea behind Jack Reacher's character: he may not belong to any institution, but he possesses a powerful personal code. When someone uses power to exploit others, when innocent people are placed in danger, or when an attempt is made to conceal a serious crime, Reacher becomes difficult to stop. He does not seek to control the world or build an empire. He simply refuses to walk away when he believes something is wrong.

That quality gives Chain Reaction its emotional centre. Beneath the technology, violence, conspiracy, and suspense is a straightforward human principle: actions have consequences. A murder creates questions. Lies create suspicion. Betrayal creates retaliation. And when powerful people assume that an outsider can be eliminated quietly, they discover that Jack Reacher is exactly the wrong person to underestimate.