Hostage

Mina Holbrook, a flight attendant for World Airlines, walks her five-year-old daughter, Sophia Holbrook, to school on a snowy December morning. Sophia recites every landmark along the route, a ritual born from anxiety about starting school. Adopted at 10 months old, Sophia has been diagnosed with attachment disorder, hyperlexia (the ability to read far above her age), and other conditions that create significant parenting challenges. Mina is separated from her husband, Adam, a police detective sergeant, after discovering he had an affair with their Ukrainian au pair, Katya.

Mina is departing on Flight 79, the inaugural nonstop commercial flight from London to Sydney. She secretly engineered a shift swap to be on this historic flight, lying to Adam that the assignment was mandatory. At drop-off, she notices Sophia's EpiPen, which treats a severe nut allergy, is missing but confirms the school has a spare. She leaves a teenage babysitter named Becca to handle pickup. Meanwhile, Adam's boss, Detective Inspector Naomi Butler, confronts him about a high work phone bill. Adam reflects afterward that the affair with Katya is "the least of my problems" (16), hinting at a deeper crisis.

Mina boards feeling an unfamiliar dread. The Wi-Fi, a key selling point of the flight, is not working. Hours in, Sophia's EpiPen appears on the galley counter with no explanation. Shortly afterward, passenger Roger Kirkwood collapses and dies. When Mina retrieves his wallet, a photograph falls out: a home-printed image of Sophia taken through her classroom window that morning. A grainy residue in Kirkwood's glass suggests something was crushed into his drink. Terrified, Mina hides the evidence, unable to contact Adam with the Wi-Fi down.

In England, a debt collector beats Adam at the front door. Adam confesses to Becca that he never had an affair with Katya. His real secret is a gambling addiction that has spiraled into catastrophic debt: He borrowed 10,000 pounds from a loan shark, a sum that has nearly doubled. The enforcers previously threatened Katya and Sophia, which is why Katya fled. Adam let Mina believe the affair rather than expose his addiction.

On the plane, Mina finds a handwritten note among cleared trays instructing her to lure one pilot from the flight deck and allow the occupant of the adjacent bathroom to enter. It concludes: "That is all I will ask you to do, Mina, and if you do it, your daughter will live. Don't, and she will die" (114). Knowing that standard procedure will not protect Sophia, Mina invents a pretext to draw First Officer Cesca Wright from the cockpit. The man from seat 7G walks into the flight deck. Captain Mike Carrivick turns, his smile dying. The door closes.

Simultaneously, Becca reveals she is 23, not 17; her babysitter role was an elaborate cover. She holds a syringe of insulin against Sophia's neck, delivering rehearsed lines about climate change. Before Adam can act, drugs Becca slipped him take effect. He wakes handcuffed to a pipe in the cellar, Sophia on the stairs above him. A radio reports that Flight 79 has been hijacked.

The hijacker called Amazon announces the flight is "under new management" (159). Another hijacker with salt-and-pepper hair, Missouri, reveals what appears to be an explosive vest and demands the government accelerate its zero-carbon target. Eight hijackers are eventually identified, most using river codenames. When crew member Erik tries to intervene, a scuffle erupts, and 22-year-old crew member Carmel is fatally stabbed with a corkscrew. Missouri publicly declares that Mina helped the hijackers, turning passengers against her.

In the cellar, Becca drops sandwiches through an old coal chute, but they contain peanut butter, triggering Sophia's allergy. Her throat closes. The household EpiPen is missing because Becca removed it the night before so an operative could place it on the plane. Adam obtains a spare and coaches Sophia through self-injecting. Her breathing stabilizes. Using his detective instincts, Adam threatens to trace Becca through surveillance records, and she flees.

Missouri announces the government has refused the demands and declares the plane will crash into the Sydney Opera House, where 2,000 people are gathered for a concert. The other hijackers are stunned; they were promised the plane would land in a remote desert. One of them exposes the explosive vest as a fake, just wire and plastic bags. Mina deepens the rift by revealing that two hijackers had been secretly involved with each other, violating Missouri's rule that no members were to know one another beforehand.

Mina charges toward the flight deck with Cesca, a bearded passenger named Rowan, and journalist Derek Trespass. Cesca enters the emergency override code, and the door opens. Inside, Captain Carrivick and Amazon are dead, strangled. Missouri swings the cockpit fire ax, striking Cesca in the head. Mina wraps a headphone cord around Missouri's neck and pulls until Missouri goes limp. The relief pilots are found poisoned in their bunks. All four pilots are dead.

Hours after Becca's departure, the loan shark returns and sets the house ablaze. Adam, still handcuffed, lifts Sophia on the soles of his feet until she reaches the coal chute opening, mimicking the "flying" game she plays with Mina. He sends her into the snow in pajamas, instructing her to follow the memorized school route to the police station. Sophia runs the route, falls on the icy pavement, gets up, and reaches the station's external emergency phone. She gives her address and her father's badge number. Firefighters break in and cut Adam free.

Derek insists Mina fly the plane, knowing she once trained as a pilot. In the captain's seat, a flashback reveals that during her first dual flight 11 years earlier, her instructor sexually assaulted her in the cockpit at 9,000 feet. She never reported the assault, and the instructor later died in a crash with another student. Mina has carried guilt ever since, believing her silence cost that woman her life. Rowan's presence in the confined cockpit triggers the memory, and she screams at him to leave. Alone, Mina contacts Brisbane Center, where a pilot named Charlie guides her through the instruments. She accidentally disengages the autopilot, and the plane banks dangerously before Charlie talks her through re-engaging it. On her first approach she misses the runway intercept and must circle on dwindling fuel. On the second attempt, the plane descends on autoland. Flight 79 lands safely in Sydney.

Three years later, the surviving hijackers stand trial at the Old Bailey, London's central criminal court. Each receives a life sentence with a minimum of 40 years. The true mastermind is revealed through first-person chapters labeled "Passenger 1G" that run throughout the novel: Rowan Fraser, the seemingly heroic passenger who helped storm the flight deck. A mathematics teacher and veteran environmental activist, Rowan recruited every hijacker through online personas, positioned Missouri as the visible leader and fall guy, and planted evidence in her house to deflect suspicion.

In the final pages, Sophia, now nine, reveals that Rowan spent private time with her during the trial, disclosing his role in the hijack and proposing she become the face of his next campaign. He told her Adam and Mina are merely carers and that he chose her. Sophia draws her own conclusions. She bakes four batches of shortbread decorated with edible flowers: Three carry harmless petals, while the fourth, given to Rowan, is decorated with foxglove, a poisonous plant. In the taxi home, she watches her parents eat their safe biscuits and reflects that at nine she cannot be arrested. The novel ends with Sophia smiling and declaring she really wanted Rowan to have the purple ones.