Published in 2026, In the Wake of the Ruined is a dark fantasy romance novel by Kalie Cassidy. It is the second and concluding installment in the Siren Mage duology, which begins with Cassidy’s debut, In the Veins of the Drowning. The story follows the powerful Siren, Imogen Nel, immediately after she kills her tyrannical father and claims his throne. Physically weakened and bound by a parasitic magical connection to an ancient, monstrous deity, Imogen must form a desperate alliance to rescue her kidnapped friend, a mission that requires her to sneak aboard the royal warship of King Theodore, the man she loves but is forbidden to be near. The novel explores several themes as Imogen grapples with her newfound power and a dangerous political landscape, including The Reclamation of Bodily Autonomy, The Corrupting Nature of Power, and Love as an Act of Resistance.

This guide refers to the 2026 Little, Brown and Company first edition.

Content Warning: The source text and this guide contain depictions of graphic violence, physical and emotional abuse, sexual content, cursing, and death.

Plot Summary

Weakened by magic and an infected stab wound after killing her father, King Nemea, and sinking his fleet, Imogen Nel crawls from the sea onto the shores of Varya, suspecting that her former governess and old friend, Agatha, has been abducted. She is found by Commander Lachlan Mela, who informs her that King Theodore’s royal council has officially banished her from the kingdom. Desperate, Imogen explains that the empress of Obelia, Nivala, has taken Agatha to the blighted island of Anthemoessa. This island houses the ancient, monstrous deity Eusia, who has a renewed blood bond over Imogen. Lachlan, who has long loved Agatha, agrees to help Imogen escape the palace. They create a diversion and flee to Panos Port, only to find that Theodore’s ship, the Eleuthios, has already departed for Obelia, where he is to hold a wedding celebration with his new bride, Nivala’s daughter Princess Halla. Using her Siren power to control the sea, Imogen summons nekgya—undead Sirens bound to Eusia—who help them climb aboard the ship undetected.

Onboard the Eleuthios, Imogen and Lachlan disguise themselves as a mariner cadet and an officer. Unbeknownst to them, King Theodore, heartbroken by Imogen’s departure, has altered his marriage contract with Halla and refuses the traditional blood bond and infuriating his devoted chancellor, Eftan. Imogen reveals to Lachlan that her stab wound from Nemea is magical and that her Siren lure—a powerful magical call—has been corrupted, allowing Eusia to access and control it. Terrified she might inadvertently harm Theodore, she makes Lachlan promise to kill her if she loses control. After Theodore and Halla’s wedding, Lachlan and Imogen respectively confront them, hoping to force Halla to use her innate magical abilities to perform a death spell on Eusia. To prove the empress’s treachery to Theodore’s council, Imogen performs a locating spell, which confirms the empress is on Anthemoessa. The spell’s aftereffects cause a surge of power that Imogen can barely contain upon seeing Theodore. Believing her a threat to the king and the realm, Chancellor Eftan stabs Imogen.

Theodore rushes to Imogen’s side, using his god-like healing power to forcibly remove the spell from her stomach. Imogen’s voice and eyes temporarily transform, becoming inhuman like Eusia’s. Theodore has Eftan locked in the ship’s brig. Now aware Imogen is aboard but respecting her wish for distance from him, Theodore orders the ship to Anthemoessa. As they approach the blighted island, the weather turns unnatural, and a sea monster—Eusia’s disembodied entrails animated by magic—attacks. Imogen taps into her corrupted bond to access Eusia’s power, calming the storm and guiding the Eleuthios safely through the island’s treacherous reef into the lagoon.

Ashore, the group searches the ruins of Raidne Keep, the former castle of Imogen’s mother, the Great Goddess Ligea. After an intimate encounter between Imogen and Theodore in a grotto dedicated to Ligea, where she is free of Eusia’s influence, they discover a hidden chamber where Agatha is submerged in a pool. Fleshy veins pierce her body, siphoning her life force to sustain Eusia’s power. After Imogen frees a traumatized Agatha, she dives to the bottom of the pool to confront Eusia. Instead, she finds her mother’s body in a death-like stasis, being drained of her divinity. Realizing Eusia is feeding on Ligea, Imogen kills her mother, severing their connection. Theodore discovers from a book of magic that breaking Imogen’s blood bond with Eusia requires both a death spell and a magical severing draught. He attempts to learn the spell by practicing on a rat, but the magic makes him violently ill. Realizing they need an expert, they set a course for the island of Della to seek help from its Mage Seer.

In Della, they visit the Mage Seer, an ancient, insect-infested woman who is secretly a devotee of Eusia. They trick her into giving them several vials of severing draught, but not before she tastes Imogen’s blood and realizes Eusia’s plan to possess a being with the combined power of a Goddess, queen, and Mage. Imogen uses her lure to incapacitate the Mage Seer, and they escape. Aboard the ship, a vision reveals that Halla is Imogen’s half-sister—the unacknowledged daughter of Nemea and the empress, Nivala. The vision also discloses that Nivala’s original bargain was to provide Eusia with a Gods-blooded child to feed on; she failed when the powerless Nemea tricked her. Eusia rejected Halla, who must now bear Theodore’s divine-blooded child to repay her mother’s debt. Their arrival in Obelia is a trap; they are taken to a mountain stronghold, Fort Vuoria, where Imogen’s sea-based powers are weakened. During the journey, one of the two necessary vials of severing draught is stolen.

At the fort, Theodore suggests to Nivala that he give Halla a child, but not continue their marriage; he wishes to be parted from her after this. Nivala accepts with suspicious calm. They leave for the region’s more opulent seaside palace, Mustkiva, for a feast celebrating Theodore and Halla’s union. Theodore’s trusted marshal, Aleka Baros, is revealed as another Eusia-worshipper. She drugs and kidnaps Imogen, taking her to Eusia’s true sanctum hidden beneath Fort Vuoria. There, Aleka begins preparing Imogen as a sacrifice by cutting off one of her wings. Though weakened, Imogen uses her Siren song to paralyze Aleka. Halla arrives, seemingly to help Eusia, just as Agatha and Lachlan discover the empress’s sacrificial throne room is located directly above the sanctum. Nivala offers some of her blood to aid in raising Eusia. Agatha performs the death spell on Eusia as Halla performs one on Nivala, killing her mother. Agatha’s spell and the lack of blood sacrifice sustaining Eusia just as Imogen takes the severing draught to break their bond kills Eusia just as she emerges from her pool. Near death, Imogen falls unconscious as Theodore smashes through the ceiling and rescues her.

Imogen awakens days later on the Eleuthios. Her bond with Eusia is broken, and though she has lost a wing, she is finally free. Theodore informs her that his marriage to Halla was annulled; Halla, now empress of Obelia, demanded only a book of spells in return. One year later, Theodore has abdicated his throne and established a republic in Varya. He arrives at a small cottage where Imogen lives as a local healer and unofficial Mage Seer. He reveals he has left his duties behind for her. Kneeling before the fire, he proposes marriage. Imogen accepts by offering her palm, ready for him to perform a blood binding and begin their new life together.