Caspia wakes screaming from a vision of her sister Emery’s suffering: Imprisoned and pregnant, Emery is periodically strapped to a table to have her blood extracted while a mutilated man languishes in the adjacent cell. Coming to her senses, Caspia finds herself in an unfamiliar stone cabin with a sprained ankle and borrowed clothes and recalls Xandra shifting into a bariwolf and attacking her before she fell into a river. A tall, sandy-haired man named Andreas enters; Caspia’s use of the word “stop” gives them a foothold in a shared dialect he calls the old language. He returns her clothes, boots, and the weapons and valuables stored inside them. Over a shared meal, she resolves to learn his language in order to find the silver-eyed warrior who killed Emery. She asks what continent they are in; confused, he tells her it is Calandra.

Setting out through the cave ginger bogs, Odessa, Evie, and guide Sryker follow a fenced trail beside alligask-filled ponds. Sryker explains that harvesters use livestock as bait to occupy the monsters, and that his alligask-hide coat—earned after surviving an attack—seems to deter others. Evie asks about Luella and Ransom; Odessa confirms that Luella is dead but promises to find Ransom. After an alligask swallows a pig whole, another slams into the fence and eventually breaks through. In the chaos, Faze tumbles to the ground. A crossbow bolt through the alligask’s eye barely slows it. At the last moment, a white-haired warrior on horseback kills the creature with a thrown ax. Surrounded by riders whose armor matches that of the man who killed the alligask, Odessa recognizes him as the warrior Thora from the journal. Thora notes that the alligask’s blood is green—a sign of Lyssa infection. A dark-haired man named Jodhi briefly seizes Faze before returning him and introduces the group as the Mavins.

Days into her recovery, Caspia wakes from a vision of a brown-haired woman being tested in combat by the silver-eyed warrior. Andreas nursed her through five days of fever after pulling her from the Coraness River and has since been teaching her Calandran. Growing feelings for him drive Caspia to announce that she must leave before she loses the will to do so; he protests but eventually accepts. She has also noticed that her senses and physical strength have sharpened considerably since arriving. Framing her journey as her family’s rite of passage and a search for Xandra, she keeps her true purpose—finding the silver-eyed warrior in Turah—to herself. Andreas tells her he is returning to Quentis; she vows to find him there. They embrace but do not kiss, and when he walks out the door she understands it is their goodbye.

That evening in the town of Middle, a temporary settlement dedicated to farming cave ginger, Sryker tells Odessa that the day’s attacks were unusually numerous, strengthening her fear that monsters are drawn to her. He advises her to ride with the Mavins, then departs. Odessa approaches the Mavins’ camp and offers each member a thousand zillahs payable on arrival in Quentis. They laugh and refuse, requiring payment up front. As she turns to leave, she mutters that the migration is almost here; Thora overhears and demands an explanation. Odessa explains that a crux scout attacked Ellder, though she doesn’t mention that the scout abducted her husband, Ransom. One Mavin, Mose, immediately breaks ranks to warn his family, while the rest remain skeptical—Jodhi accuses her of fabricating the story for a free escort. Thora asks her name, and upon hearing it agrees that the Mavins will take Odessa to Quentis for the promised payment.

Caspia wakes to find Andreas gone, but he has left her a satchel with food, gold, and a detailed map. Setting out alone, she encounters a fenek on the road. In her home kingdom of Nelfinex, feneks are beloved and gentle companions, but here it attacks viciously. She flees rather than draw a weapon, but when it overtakes her she pulls a knife to defend herself. Before she can strike, an arrow drops the beast. Andreas emerges from the trees; he had followed at a distance. Caspia grieves the fenek’s death, explaining that in her homeland they are cherished pets. Andreas announces that he will accompany her to Turah, telling her he is fond of the woman she already is and the woman she will become. She pulls him into a kiss, and they set off together.

Odessa has spent the past four days crossing the desert of Laine with the Mavins. Jodhi continues to mock Odessa’s crux scout story. When she mentions that her husband is in Quentis, Evie overhears; Odessa quietly explains to Evie that Ransom—not Zavier, who Evie believes is her father—is her true husband, emphasizing that this truth must be kept secret. Evie fears that she no longer belongs with Odessa and breaks down; Odessa reassures her that nothing will change. That evening, Thora reveals she already knows Odessa is the Sparrow, Princess of Quentis, and that the Mavins’ only goal is to collect payment from the Gold King. When Jodhi turns his attention toward Evie, Odessa places a hand on her sword in warning. The Mavins return from hunting with a dead kaverine—a nocturnal Laine creature whose blood is green with Lyssa. Golding has claw wounds, and Odessa urgently asks whether the beast bit him; relieved it did not, she prepares to explain everything she knows about the infection.

Weeks into her travels with Andreas, Caspia is now in the deserts of Laine. She is tormented by a recurring vision of Xandra commanding an army of bariwolves that slaughter people in a log-walled fortress—with Andreas dead at Caspia’s feet. During a quiet evening at camp, guilt compels her to tell him the truth: that she is a Nelfinex princess who came to Calandra not only to find Xandra but to avenge her sister Emery’s murder. She clarifies that her visions are real glimpses of the past and that they have revealed that a silver-eyed warrior killed Emery in Turah. She shows him her elfalter pendant bearing the Starling crest. Andreas believes her without hesitation. Overwhelmed by his trust, Caspia weeps, and they spend the night together.

For two days, Thora interrogates Odessa about Lyssa; she accepts that the infection is real but doubts the early migration timeline. She dismisses most of the Mavins on a separate task, keeping only Jodhi, Mathias, Golding, and Dair. Camping in a cave on the Genesis border, Odessa realizes that Golding and Dair are a couple—forbidden under Mavin rules. The group explains their circumstances: Each is indebted to someone named Salem, who controls them through that debt and uses members as informants against one another. Mathias recounts how Salem threatened his mother to force him into service. When Odessa asks about the Voster brotherhood, Thora silences her immediately. Jodhi warns Odessa to get rid of Faze before he becomes truly dangerous. The night ends tensely when bariwolf clicks echo from the dark; Thora scouts and confirms wolves are nearby, and the group shelters in the cave on high alert.

Caspia has delayed their departure from Skanshon for four days because her vision of Andreas’s death has now appeared six times with growing detail, revealing his armor’s crest and a gold wedding ring on his hand. To distract themselves, they explore Skanshon’s iron-trade marketplace, where Andreas buys her a kukri. A young boy named Kos attempts to pick Andreas’s pocket; Andreas catches him, retrieves his coin purse, and gives the boy bread with a quiet warning. As Kos disappears into the crowd, Caspia experiences a waking vision for the first time: She sees Kos alone in a filthy tent while a larger child steals his bread. Realizing she may be able to change the future, she insists that they find the boy immediately.

Caspia and Andreas search the marketplace for Kos. A vendor directs them to abandoned buildings by the river, where they find Kos in a tent that matches her vision exactly. They bring him back to the inn, where Caspia recognizes him from a vision she had aboard the ship to Calandra: a boy surrounded by floating books. That night, she tells Andreas that she is giving up her quest for vengeance and wants to sail to Quentis instead of continuing to Turah, hoping the decision will prevent the death she has foreseen. Andreas agrees, and two days later all three board a ship bound for Quentis.

Riding through the skeleton forest—a desolate stretch of charred, lifeless trees—Odessa reads from Luella’s journal to calm a frightened Evie. Jodhi unexpectedly reveals that he understands the old language, translating one name as Titus. Nine bariwolves emerge from the trees and are killed quickly, but a second wave of roughly a dozen attacks at once. Mathias orders Odessa to flee; he later dies when a wolf tears out his throat. A bariwolf shreds Freya’s hip, sending Odessa and Evie to the ground. Jodhi circles back for them, but with two wolves closing fast, there is no chance that all three will escape. Odessa passes Evie and Faze up to Jodhi and orders him to ride. She mercy-kills the mortally wounded Freya, then stands alone to face the remaining wolves—until a sword cuts one down and Ransom charges out of the trees on his black horse, Aurinda.

Ransom kills a second wolf—its blood is green—then dismounts and cuts down a third. He and Odessa reunite, and he declares that their relationship will no longer be a secret. Thora rides up and addresses Ransom with open hostility; they clearly share prior history. She reports that every wolf in the pack carried Lyssa. Ransom asks whether anyone saw a one-eyed bariwolf, suggesting that the infected pack leader from Turah has tracked Odessa into Genesis. Jodhi returns with Evie, who collapses into Ransom’s arms. Thora leaves to recover Mathias’s body, and Jodhi tells Odessa that Golding and Dair slipped away to warn Mathias’s family before Salem learns of his death. Ransom holds Odessa and calls her his queen as she grieves Freya.

Days into the coastal voyage to Quentis, Kos confronts Caspia, asking why she doesn’t have the colored starbursts that mark the eyes of everyone in Calandra, identifying their kingdom of origin; she tells him that she is from Nelfinex, on another continent called Kenn, which he refuses to believe. Andreas confirms that he has never found any record of other continents, then recounts a children’s myth about a woman devoured by the strange animals she brought back from beyond Calandra. Caspia wonders whether the truth has been deliberately suppressed. She reveals the Starling bloodline’s defining secret: their ability to shapeshift. Xandra shifted into a bariwolf and attacked her and may be permanently trapped in that form. Alarmed, Andreas makes Caspia vow never to shift. He plans to search Quentis’s royal library for information on Kenn and the Starling. When Caspia describes Nelfinex’s giant birds called swifts, Andreas goes pale: In Calandra they are called crux—monsters that migrate once a generation and kill every living creature in their path.