Blue Moon

The novel opens in an unnamed mid-sized American city where organized crime splits between two factions: Ukrainians control the west side and Albanians control the east, separated by a boundary along Center Street. Gregory, the Ukrainian boss, crosses into Albanian territory to meet Dino, the Albanian boss, at a lumber yard that serves as Albanian headquarters. Gregory claims his spy found a list of four confidential police informants and shares the Albanian names as a gesture of good faith. Dino agrees to eliminate his own traitors. In reality, Gregory has fabricated the story to trick Dino into killing two loyal men, weakening Albanian defenses for a Ukrainian takeover of part of their business.

Jack Reacher is riding a Greyhound bus when he notices a young man eyeing a fat envelope of cash in an elderly passenger's pocket. When the old man, Aaron Shevick, exits at the city's bus depot, the young man follows and mugs him. Reacher intervenes, recovers the envelope, which holds over $20,000, and returns it. Shevick refuses to involve police, explaining the money is a critical payment. Reacher deduces Shevick is headed to pay a loan shark.

Reacher accompanies Shevick to a bar where an Albanian moneylender named Fisnik normally holds court, but Fisnik does not appear. They eat lunch at the Shevick home with Aaron's wife, Maria. Reacher observes the couple has sold nearly everything and signed their house over to the bank. Meanwhile, Fisnik has been lured to the lumber yard by Dino and killed based on Gregory's fabricated accusation.

When Reacher and Shevick return that evening, a pale man with a Cyrillic prison tattoo occupies the corner table: a Ukrainian who has taken over Fisnik's operation. Reacher impersonates Shevick and notices the new man's ledger is blank. He talks the man into accepting only $1,400 as full payment, saving the Shevicks over $20,000. Their relief is short-lived. A phone call reveals they need another $40,000 by morning.

The Shevicks reveal the crisis. Their daughter Meg developed cancer while working for a tech start-up founded by a young Ukrainian immigrant named Maxim Trulenko. The company secretly collapsed, and Trulenko let the employee health insurance lapse without telling anyone. The Shevicks signed a hospital guarantee, making themselves liable for Meg's expensive experimental treatments. Government and insurance no-fault funds have stalled because, from a bureaucratic perspective, the patient is already receiving care. Maria asks Reacher to borrow money in Aaron's name, since the moneylender already believes Reacher is Shevick.

Reacher borrows $20,000 on brutal terms, with one week to repay $25,000. The moneylender photographs Reacher's face, linking it to Shevick's name. Two Ukrainian enforcers insist on driving "Shevick" home. Reacher attacks both men en route, causing a crash. Gregory interprets the incident as an Albanian provocation, igniting a tit-for-tat cycle of killings. Neither side realizes the disruption is Reacher. Both gangs theorize that an outside force, possibly Russian organized crime, is manipulating them.

Reacher visits the Public Law Project, where three young pro bono lawyers handle the Shevicks' case. One of them, Isaac Mehay-Byford, theorizes that Trulenko embezzled millions and may still have hidden assets, but any legal resolution would take months. That night, Reacher drops Trulenko's name at a bar on the Ukrainian side. Within minutes, armed men converge on his position. Abigail "Abby" Gibson, a waitress and longtime city resident, pulls Reacher to safety through a back door. The speed of the response proves Trulenko is paying for Ukrainian protection and still has money.

When Ukrainian enforcers trace "Aaron Shevick" to the Shevick house, Reacher and Abby help maintain a cover story that quickly unravels. The enforcers photograph the group, exposing Abby's identity. Maria, who had earlier pawned family heirlooms at a shop across from Gregory's office, is also recognized there. After Reacher is forced to shoot two Ukrainians staking out Abby's compromised home, the pair relocate to the east-side house of Frank Barton, a musician, and his lodger Joe Hogan, a drummer and former U.S. Marine. They enlist Guy Vantresca, a former Army officer fluent in Ukrainian and Albanian, to translate captured phone messages. The texts reveal both gangs are hunting Reacher and Abby and have heightened security around Trulenko's secret location.

An Albanian enforcer tracks them to Barton's house, and Reacher defeats him. Later, two Albanian gunmen catch Reacher and Abby in the open. Unwilling to risk Abby's life, Reacher surrenders, and both are locked in a car trunk. They arrive at the Albanian lumber yard at the moment Dino's right-hand man, Jetmir, shoots Dino during a power struggle, triggering an internal firefight that kills most of the Albanian leadership. Reacher escapes the trunk using a small backup pistol hidden in his sock, fights his way out, and sets the building on fire.

Reacher calls Barbara Buckley, a Washington Post journalist, and learns that the Ukrainian gang has been contracted by the Russian government to run internet disinformation operations inside the United States. Reacher deduces that Trulenko, whose disappearance coincided with a dramatic improvement in the Ukrainians' capabilities, is managing the operation from a secret facility. He raids the moneylending bar, kills the pale operator, and recovers enough cash to fund Meg's next medical scan. Abby tells Reacher that Danilo, Gregory's chief of staff, once subjected her to a filmed punishment of 40 slaps to the face after she reported a doorman's beating of a patron to police.

Reacher deduces Trulenko's location: three rented floors in a new downtown office tower, with the top and bottom floors as buffer zones and the working floor in the middle. His team first infiltrates Gregory's headquarters through a secret escape tunnel that Reacher deduced a paranoid leader would have built. They recover Maria's pawned heirlooms from the adjacent pawn shop. When Reacher forces open the concealed entrance behind a bookcase in Gregory's office, the bookcase falls on Gregory and breaks his neck. Reacher then executes Danilo for what he did to Abby.

The team assaults the office tower, storming the lobby and sending elevator cars upstairs as a tactical feint. Vantresca, disguised as a bound captive, lures defenders into opening a security gate, then opens fire while Reacher and the others emerge from the adjacent elevator in crossfire. On the 19th floor, they find laptops managing disinformation, identity theft, and pornography operations. Motivated by the organization's exploitation of trafficked women and the filmed abuse Abby endured, Reacher forces Trulenko to delete all pornography content from the internet. He orders Trulenko to wire his personal $4 million into Gregory's liquid account of $29 million and transfer the combined $33 million to Aaron Shevick's bank account. Trulenko complies. Reacher shoots him.

Reacher visits the Shevicks one last time, returning Maria's heirlooms and telling Aaron to use the money for Meg's care, to help others in similar situations, and to support the Public Law Project lawyers. He and Abby spend a final night together, both acknowledging their time will end. Reacher leaves the next morning by bus. Ten days later, he reads a Washington Post article reporting that organized crime has been cleaned out of the city, with the new police commissioner taking full credit.