Half of a Yellow Sun recap

Ugwu enters the Nsukka household of radical lecturer Odenigbo and his partner Olanna, while Olanna's guarded twin Kainene begins a relationship with English writer Richard. Private betrayals strain both couples, but the greater rupture comes with Nigeria's coups, anti-Igbo massacres, and the secession of Biafra. Olanna survives the slaughter of relatives in Kano; the four adults, Ugwu, and Baby are repeatedly displaced as war brings bombing, hunger, and social collapse. Ugwu is forcibly conscripted and participates in a gang rape before being wounded. Kainene runs a refugee camp and eventually reconciles with Olanna after learning that Richard once slept with her sister. Biafra is defeated. Ugwu returns and becomes the implied author of the history threaded through the novel. Kainene crosses enemy lines to trade for food just before the surrender and disappears. The family searches after the war, but her fate remains unknown.

Thirteen-year-old Ugwu leaves his village to become houseboy to Odenigbo, a mathematics lecturer at the university in Nsukka. Odenigbo, whom Ugwu calls Master, encourages his education and fills the house with academics who debate colonial history, Nigerian politics, and African identity. Ugwu learns to manage the household and listens from the edges of these conversations. Odenigbo's partner Olanna, the privileged daughter of a wealthy Igbo businessman, moves in despite her family's preference for a more conventional match. Her twin sister Kainene manages family business interests and begins seeing Richard, an Englishman drawn to Igbo-Ukwu art and alienated from the expatriate community represented by his companion Susan. The two couples form an uneasy circle: Olanna is open and admired, Kainene guarded and sardonic, Odenigbo certain of his politics, and Richard unsure how to belong.

Odenigbo's mother visits Nsukka and rejects Olanna, accusing her education and childlessness of making her unsuitable. The narrative then moves into Nigeria's political crisis. A military coup is followed by a counter-coup and organized attacks on Igbo civilians in the north. Olanna is in Kano and finds members of her extended family murdered. Mohammed, her Hausa former boyfriend, helps her escape. On the crowded train south, the scale of the violence becomes unmistakable through the injuries and losses carried by other refugees. Olanna reaches Nsukka traumatized and temporarily unable to walk. As eastern Nigeria moves toward secession, personal life is overtaken by ethnic fear and national collapse. The independent state of Biafra is declared, initially inspiring pride and the hope that Igbo people will finally be secure.

War begins between Nigeria and Biafra. Odenigbo supports the new nation, Richard tries to report its case to the outside world, and Kainene directs family resources toward the war effort. Nigerian advances force Olanna, Odenigbo, Ugwu, and Baby to leave Nsukka. Their moves through Abba and other temporary homes reduce the comfortable intellectual life they knew to a memory. Air raids, military news, shortages, and the arrival of displaced relatives reshape daily routines. Richard witnesses violence against Igbo civilians and becomes more committed to Biafra, though his status as an Englishman complicates his claim to speak for it. The war's public language remains confident while the characters' actual world grows smaller and less secure. By this point, survival depends on finding shelter, food, and a place outside the next line of attack.

The narrative returns to the earlier Nsukka years and reveals the private crisis hidden behind the later household. Odenigbo's mother brings the village girl Amala into his life and engineers circumstances in which he sleeps with her. Amala becomes pregnant. Devastated by Odenigbo's betrayal, Olanna seeks comfort from Richard and sleeps with him once, betraying Kainene in turn. Odenigbo and Olanna eventually reconcile and marry. Amala does not want the child produced by the arrangement, and Olanna takes the infant into her home; she becomes the girl everyone calls Baby. Richard and Kainene also resume their relationship, but Richard keeps his encounter with Olanna secret. These revelations explain the bonds and concealed fractures carried into wartime: Baby's place in the household, Olanna's difficult trust in Odenigbo, and the unspoken act that could divide the twin sisters.

The story returns to the deepening war. The household is displaced again, eventually sharing cramped quarters in Umuahia as food and privacy disappear. Odenigbo's confidence erodes; grief and helplessness drive him toward drink, while Olanna works to keep Baby safe and maintain a school for displaced children. Kainene becomes an effective organizer at a refugee camp, bargaining for supplies and confronting corruption. Richard assists her and continues trying to write about the war. The truth about his night with Olanna finally reaches Kainene. Feeling betrayed by both her lover and her sister, she cuts them off, adding a family separation to the physical divisions of war. Hunger becomes visible in children's swollen bodies, relief flights are inadequate, and the promised endurance of Biafra is increasingly at odds with civilian reality.

Bombing and hunger intensify as Biafran territory contracts. Olanna and Kainene cautiously reconcile, their shared history proving stronger than the betrayal even though Richard's relationship with Kainene remains damaged. Ugwu, now old enough to attract military patrols, is seized and forced into the Biafran army. Training brutalizes the recruits and teaches them to hide fear behind violent performance. During a drunken visit to a bar with other soldiers, Ugwu joins in the rape of a woman, an act that becomes a lasting source of shame. He is later badly wounded in battle and reported dead. The family grieves without certainty, while Richard and Olanna's households continue amid raids, starvation, and the increasing likelihood of defeat. The intellectual confidence of Nsukka has given way to survival and moral injury.

Ugwu survives his wounds and returns, physically changed and burdened by what he did as a soldier. Biafra collapses under starvation and military defeat, and its leaders surrender. Before the end, Kainene begins crossing into Nigerian-held territory to trade for scarce food. On her final trip she does not return. After the surrender, checkpoints and front lines open, but Olanna, Richard, and their companions find no confirmed record of her among the living or the dead. They search hospitals, official offices, roads, and crowds of returning people. Richard recognizes that his planned book cannot make Biafra's experience his own; the historical text appearing through the novel is instead associated with Ugwu, who has moved from watching Odenigbo's debates to recording war and complicity himself. The survivors begin life in a defeated, damaged Nigeria. Olanna performs a ritual appeal for her missing twin, but Kainene's fate remains unknown.

Biafra surrenders after mass hunger and military defeat. Ugwu, wounded but alive after his forced service, returns carrying both trauma and guilt. Richard abandons the idea that he can authoritatively write Biafra's story; the book taking shape within the novel belongs to Ugwu. Shortly before the surrender, Kainene crosses into Nigerian-held territory to trade for food and never returns. After the war, Olanna, Richard, and the others search hospitals, offices, roads, and returning crowds, but find no reliable trace of her. Olanna uses the family custom of scattering earth to call a lost person home, while Richard remains suspended between hope and grief. The surviving household returns to damaged places and begins the practical work of living after defeat. Kainene's fate remains unresolved, making her absence the novel's final wound and denying the survivors a complete reunion or explanation.