Set on a Mississippi cotton plantation in the antebellum South, the novel centers on the love between two enslaved young men, Isaiah and Samuel, whose bond becomes a flashpoint for the cruelties and conflicts that define life under slavery. The plantation, owned by the Halifax family, is known among the enslaved as "Empty." Framing the narrative are the voices of "the Seven," ancestral spirits who address their descendants from the darkness, urging them to remember their origins and warning that a story is coming.
Isaiah and Samuel work together in the barn, tending to the plantation's animals. The barn has become their sanctuary, a place where they share intimacy, laughter, and a love that stretches back to childhood, when their hands first brushed by the river roughly sixteen seasons ago. Isaiah is gentle and open; Samuel is guarded and suspicious of hope. Together they form a private world. Yet the other enslaved people have begun treating them with contempt, and the two do not fully understand why the hostility has grown so sharp.
The novel's polyphonic structure shifts between perspectives to reveal the forces converging on Isaiah and Samuel. Maggie, the enslaved cook who works in the Big House and sleeps on the enclosed back porch, practices subtle resistance, poisoning the Halifaxes' food with snake venom and ground glass. She has secretly observed Isaiah and Samuel's love and finds it beautiful. Maggie is the keeper of old knowledge passed down from her grandmother, Cora Ma'Dear, and she recognizes the two men's bond as something ancient and worthy of protection.
Essie, another enslaved woman, is married to Amos, an enslaved preacher, through a broom-jump ceremony, a marriage ritual practiced by enslaved people. Amos struck a deal with Paul Halifax, the plantation's master: In exchange for preaching Christianity and promoting obedience, Amos secured a degree of protection for Essie, whom Paul had previously raped, fathering her pale-skinned baby, Solomon. Essie delivers Amos's message to the barn: The punishments are worsening because Isaiah and Samuel refuse to breed with women as Paul demands. They reject the appeal.
Amos's motivations are tangled. He carried Isaiah as a child from a slave wagon after promising the boy's mother he would protect him and reveal his birth name, Kayode. Now Amos withholds that name as leverage, telling Isaiah he will share it only when Isaiah complies. After discovering Isaiah and Samuel's relationship, Amos began preaching against them, and most of the enslaved community gradually turned against the two men. Another enslaved man, Big Hosea, physically attacks Samuel at the river.
Other characters occupy distinct positions. Be Auntie, who cares for many of the plantation's children, agrees to steer Puah, a fierce young enslaved woman in her care, toward Samuel so he might breed. Puah harbors feelings for Samuel but eventually sees that his heart opens only for Isaiah. Sarah, an enslaved woman brought from Africa, recognizes Isaiah and Samuel's bond as sacred and ancient. She once loved a woman named Mary in Charleston and was sold to Mississippi after attacking an enslaver.
Interwoven with the plantation narrative are chapters set in pre-colonial Africa, depicting King Akusa of the Kosongo people, a woman king who rules with authority. Portuguese missionaries arrive at the village just before the bonding ceremony of Elewa and Kosii, two young men who serve as sacred gate guardians. Brother Gabriel, the missionary leader, is horrified by the ceremony. A devastating flash-forward reveals what the king cannot know: Hundreds of Portuguese will arrive from the sea, enslave the Kosongo, and chain Kosii and Elewa. Later chapters follow Kosii through the Middle Passage, the forced Atlantic crossing of enslaved Africans, where he discovers Elewa's corpse among the dead. Kosii wraps his chains around a sailor's neck and throws himself overboard, choosing death over captivity.
Back on the plantation, Timothy Halifax, Paul and Ruth's only surviving son, returns from college in Boston. A closeted queer man and painter, he summons Isaiah to his bedroom, teaches him to read, and initiates a sexual encounter. Isaiah submits. When he returns to the barn, Samuel senses the betrayal. They argue but reconcile through an intimate exchange, naming the things they love about each other's bodies.
Ruth Halifax, Paul's wife, wanders into the barn at night and attempts to assert herself over Samuel, but he does not respond. Humiliated, she tells James, the chief overseer, that the two men looked at her without shame. James chains Isaiah and Samuel together, strips them, and forces them to drag a loaded wagon around the plantation while being whipped. Isaiah collapses, and Samuel hauls him back to the barn. Maggie summons women to perform an ancestral healing ritual, mixing herbs into a paste and laying hands on the men's torn backs.
Amos then goes to Paul's study and accuses Isaiah and Samuel of sodomy. Maggie reads pig bones and sees catastrophe. She tries to block Amos's path with salt and drawn symbols, but he steps over every barrier, pushes her to the ground, and enters the Big House to deliver his accusation. Paul decides to sell the two men at auction.
The climax unfolds rapidly. Isaiah and Samuel plan to flee: Free the animals, cross the river, head north. Samuel hides an ax behind his back. They kiss, and Samuel tells Isaiah to run before heading to the Big House. There, Timothy promises Samuel manumission, the legal granting of freedom to an enslaved person, once he inherits the plantation. But the idea that freedom is a master's gift sickens Samuel. He kills Timothy with the ax.
Paul orders Samuel hanged, and James lights the body on fire. Maggie stabs Paul in the back of the neck with a kitchen knife, killing him. In the chaos, a shattering revelation emerges: Samuel was Maggie's last surviving child, her son by a man she loved named Ayo Itself, whom the Halifaxes called Daniel. She had separated herself from Samuel to survive. Adam, the biracial coachman who is almost certainly Paul's unacknowledged son, tackles James but is shot dead. Essie carries Solomon to the river, breaks the baby's neck, and throws him in, refusing to let Paul's child survive as proof of her violation. Sarah charges the overseers while Puah escapes across the river. Maggie sets fire to the Big House and the cotton fields, rallying the survivors and commanding them to rebel.
Isaiah swims across the river and staggers into the forest, where a hand grabs his ankle. It is Samuel, dripping wet and seemingly alive. They embrace. Then Samuel begins to glow. He screams "KAYODE," Isaiah's birth name. The name burns a mark across Isaiah's chest, and Samuel's body bursts into points of light that swirl upward and vanish into the night sky. Isaiah, alone and devastated, follows a single remaining speck deeper into the forest until he reaches a place of living darkness. He reaches into it and feels something smooth and familiar. He screams a word, and the darkness screams it back in ululation, a sound of recognition and welcome. The Seven close the novel by naming love as the living word and declaring that nothing can stop the coming reckoning except the reader.