Bullet Train

Set aboard a high-speed Shinkansen bullet train traveling from Tokyo to Morioka in northern Japan, the novel follows five assassins and criminals whose separate missions become violently entangled over the course of a single morning.

Yuichi Kimura, a former criminal in recovery from alcohol addiction, boards the train with a silenced handgun, intent on killing the teenager who pushed his six-year-old son Wataru off a department store roof, leaving the boy comatose. His target is Satoshi Oji, a 13-year-old sociopath known as the Prince, whose angelic appearance conceals a history of manipulation and murder stretching back to age 10. Before Kimura can act, the Prince stuns him with a homemade taser and binds him, revealing that he planted the intelligence Kimura used to find him. The Prince explains his leverage: an accomplice near Wataru's hospital will tamper with the boy's life-support equipment if the Prince fails to answer scheduled phone check-ins. Kimura, realizing his son's life depends on compliance, is forced to submit.

In car three, professional killers Tangerine and Lemon sit with Little Minegishi, the kidnapped son of Yoshio Minegishi, one of the most feared crime lords in Japan's underworld. The pair rescued the young man the night before and are transporting him to Morioka along with a suitcase of ransom money. When Lemon retrieves the suitcase from a luggage area between cars, it is missing. Moments later, they find that Little Minegishi has died in his seat with no visible wounds. They now face delivering a dead heir and no money to one of the underworld's most ruthless men.

Nanao, an extraordinarily unlucky operative who works under his handler Maria, boards the train with a simple assignment: steal the black suitcase and get off at Ueno, the next stop. He locates it easily, but as the doors open, the Wolf, a low-level criminal with a grudge, forces his way aboard and blocks Nanao's exit. In the ensuing struggle the train lurches and Nanao accidentally snaps the Wolf's neck. He hides the suitcase behind a concealed panel in the gangway wall and props the Wolf's body in its ticketed seat to look like a sleeping passenger.

The Prince, observing the chaos, discovers the hidden panel and sends Kimura to crack the suitcase's combination lock. Inside are stacks of cash and five debit cards with PINs written on the backs. The Prince pockets the debit cards and returns the suitcase to a visible luggage rack, preferring to watch others fight over it.

At Omiya Station, Tangerine steps onto the platform to reassure one of Minegishi's men that everything is going smoothly. From inside the train, Lemon disastrously lifts the dead man's hand and waves it like a puppet. The agent's face turns grave and he raises his phone. Tangerine knows armed men will now be waiting at Sendai.

Nanao, having missed both Ueno and Omiya, slips into car three and sits behind Tangerine and Lemon. He overhears that Little Minegishi is dead and that the pair plans to frame a third party. When Tangerine leaves, Nanao fights Lemon, knocks him unconscious, plants alarm watches as timed distractions, and pours sleeping medicine into Lemon's water bottle before fleeing. He evades Tangerine's pursuit through the rear cars by improvising decoys, including a wig on a bribed stranger and a tripwire, before doubling back while one of the beeping watches distracts Lemon.

The suitcase reappears on its original rack, placed there by the Prince, and Nanao retrieves it and gives it to a conductor for safekeeping. Tangerine and Lemon identify the snack trolley attendant as the Hornet, a legendary assassin who uses poison needles, from a photograph. The attendant attacks Nanao near the green car, the train's first-class carriage. Nanao is pricked by a poisoned needle but manages to stab the attendant with one of her own, break her neck, and inject himself with an antidote pen from her body.

In the gangway between cars six and seven, Lemon forces the Prince and Kimura into a lethal game, demanding each identify who is the leader. Kimura raises his hand, and Lemon shoots him in the chest. They stuff Kimura's body into the bathroom. The sleeping medicine Nanao planted soon takes effect, and Lemon grows drowsy just as he is about to execute the Prince. The Prince wrests the gun away and shoots Lemon in the head.

At Sendai Station, Tangerine and Nanao attempt to deceive Minegishi's men by presenting a random suitcase and having Nanao pose as Minegishi's son. The ruse collapses when the suitcase pops open, spilling women's underwear across the platform, and they leap back onto the departing train. Tangerine discovers Lemon's body in the toilet alongside the barely breathing Kimura and is devastated. He pieces together evidence implicating the Prince: a Diesel sticker on the boy's blazer, representing a deceitful character from Thomas and Friends, which Tangerine deduces Lemon pressed there during their struggle as a final warning to his partner. Tangerine confronts the Prince and offers him a rigged gun that will explode if fired, but the Prince senses the trap and refuses. Nanao arrives, sees Tangerine pointing a gun at the seemingly terrified schoolboy, and reflexively breaks Tangerine's neck from behind, driven by a compulsion to protect children rooted in a childhood trauma.

Kimura's parents, Shigeru and Akiko Kimura, retired professionals with a fearsome past, board the train at Mizusawa-Esashi after receiving the Prince's taunting phone call. Armed despite their age, they confront the Prince in car eight. Suzuki, an exam-prep instructor who has been a quiet presence on the train, joins them and offers the Prince a measured answer to his recurring question about why killing is wrong: a functioning state requires guaranteed protection of life and property. Suzuki reveals that his own wife was murdered. When the Prince's phone rings with the check-in call from his hospital accomplice, Shigeru refuses to let the boy answer, unknowingly triggering the protocol that sends the accomplice to attack Wataru. However, Shigeru's old friend and namesake, a retired go-between he called before boarding, is hiding in Wataru's hospital room and chases off the intruder. The go-between also summoned Morning Glory, a professional killer known as the Pusher, to guard the hospital. Morning Glory shoves the fleeing accomplice into traffic, killing him. A message crosses the Shinkansen's digital ticker: "Wataru is safe. Intruder is dead."

Stripped of his leverage, the Prince faces Shigeru's gun. Shigeru tells the boy he will not escape punishment, that the Kimuras have survived more than 60 years and will outlast him. A gunshot sounds as the train pulls into Morioka. On the platform, Nanao watches Minegishi collapse with a needle in his back, apparently struck by a second Hornet, possibly the young conductor working as the attendant's partner. Maria appears, having ridden the linked companion train from Omiya, and pulls Nanao toward the exit. They speculate that the Hornets orchestrated the suitcase theft as a diversion to assassinate both Minegishi and his son.

An epilogue two months later finds Nanao at a supermarket, where media reports have recast the incident as an underworld feud. Kimura survived and is recovering alongside the now-awake Wataru. The Prince's fate remains ambiguous, with an unidentified small body found at the port in Sendai. Nanao enters a store giveaway using a ticket from Tangerine's pocket, bearing Lemon's hand-drawn picture of Arthur, the Thomas and Friends train that never had an accident, and wins third prize: a box split evenly between tangerines and lemons. For the briefest moment, the fruit seems to radiate a flash of pride, as if fulfilling the pair's promise that they would always come back.