In A Court of Silver Flames, the story picks up after the war, with order restored in the Court of Night, where Feyre rules as High Lady alongside her husband, Rhys. Cassian, Rhys’s trusted general, is sent to bring Nesta, Feyre’s sister, to the House of Wind after she has been living in a self-destructive manner, trying to cope with the trauma of the war and her transformation into a Fae. Though Nesta had gained immense power from the Cauldron and killed the King of Hybern, she is unsure of her limits and resents the changes in her life. Feyre, frustrated with Nesta’s behavior, demands that she begin training with Cassian as a warrior to help her break free from her destructive habits.
Cassian, who is sympathetic to Nesta’s pain but committed to following Rhys's orders, plans out her new daily routine. She will live at the House of Wind, a palace far above the city, where she will train in combat with Cassian every morning and assist High Priestess Clotho in the library each afternoon. Although Nesta is reluctant, the alternative of being sent to the human lands pushes her to comply. Cassian also meets with Rhys to discuss the brewing tensions between the Fae and humans, especially the human queens, who may be conspiring against the Fae. Cassian is tasked with investigating these plots, and he later winnows to meet with several key figures, including Vassa, a human queen, and the sons of the Autumn King, who are worried about a possible alliance between Briallyn, a vengeful human queen, and the Autumn King’s forces.
Despite her reluctance to train, Nesta begins her daily routine, although she resents both the training and her new life. She struggles with her past trauma and feelings of isolation, but Cassian remains patient with her. Meanwhile, she also starts to bond with Clotho and a fellow acolyte named Gwyn, who shares her tough attitude. As Nesta continues to deal with her inner turmoil, she begins to discover new powers, such as creating sparks in the stone walls after a fall down the House’s stairs. Cassian continues to try to help her, even as the tension between them grows due to their complicated history, which includes a shared moment of emotional connection during the final battle against the King of Hybern.
As Nesta’s training progresses, she continues to resist, complaining about the cold and the harsh conditions, but Cassian and Feyre try different approaches to help her find purpose and healing. Cassian, in particular, becomes more determined to support Nesta, despite the challenges she presents, and the story builds toward addressing the growing threat of human conspiracies and Nesta’s own path to recovery and acceptance in her new life.
Cassian begins training Nesta on the roof of the House of Wind, creating a private ring for their sessions. He quickly realizes that her resistance to training is rooted in her fear of appearing vulnerable in front of the arrogant male trainees at the Illyrian camp. In exchange for an hour of training, Cassian offers to grant her any favor, which Nesta unexpectedly accepts. The first session involves only stretching and cooldown, but she surprises Cassian by agreeing to continue for another hour without asking for another favor. Later, Nesta helps Gwyn, a fellow acolyte in the library, by retrieving a misplaced book, which leads Gwyn to feel indebted to her.
The next day, Nesta follows Cassian’s training without protest, and he later accompanies Rhys to the Spring Court for a meeting with Eris about Briallyn’s plans. That evening, the House of Wind provides Nesta with dinner and a bath, and she begins to feel more at peace with the house's care. However, while in the library the following afternoon, Nesta senses dark magic in the lower levels, which Gwyn believes is linked to the power Nesta drew from the Cauldron. Cassian continues to coach Nesta in basic exercises, and their growing attraction becomes undeniable, though both try to ignore it. Nesta expresses interest in training other women, particularly the abused priestesses, as warriors, a plan that Cassian supports.
When Elain visits Nesta, offering her support, Nesta rejects it and sends her sister away in tears. Later, after a long walk down the spiral stairs, Nesta and Cassian kiss, leading to a one-sided sexual encounter. The next day, the group learns of Briallyn and Koschei’s plans to find the Dread Trove, ancient objects of immense power hidden by the Cauldron. Elain volunteers to help find the Trove with her seer abilities, but Nesta reluctantly agrees to assist, despite doubts about her own powers.
Later that night, Cassian and Nesta continue their complicated relationship, with Cassian ensuring that their past encounter is resolved between them. The following day, Cassian and Nesta keep their actions a secret, but the tension remains palpable. Nesta, seeking more answers, begins researching the Dread Trove with Gwyn’s help, while also addressing her frustrations through training. After a few days, Cassian finds Nesta practicing punches in the library and realizes she staged the demonstration to inspire the other timid priestesses. Her efforts pay off when Gwyn signs up for training, signaling a small victory for Nesta in her journey to heal and regain her strength.
Gwyn joins Nesta for training, revealing that she wants to improve her skills because she never wants to feel powerless again. Their training goes well, and Nesta supports Gwyn’s desire to train despite her previous knowledge of basic exercises. Meanwhile, Cassian attends a secret meeting with Eris in Windhaven, and Nesta takes the opportunity to visit Emerie, a female shopkeeper she met earlier during her mountain training. Emerie shares her painful history of abuse, and although Nesta invites her to train at the House of Wind, Emerie hesitates. Back in Windhaven, Cassian learns that Briallyn doesn’t trust the Autumn King, Beron, and that Eris is secretly withholding information about the Dread Trove. That evening, Nesta consoles Cassian after Eris's contempt leaves him upset, which leads to a passionate encounter.
The next morning, Nesta sends Emerie a gift of spices and tea, which encourages her to reconsider and join the training. As Emerie begins her lessons, Cassian notes that her broken wings affect her balance, and he is angry at the Illyrians’ cruelty toward women. Later, Nesta tries to scry for the Dread Trove, but she is too terrified of the Cauldron sensing her. While the Inner Circle discusses their plans, Amren sets a one-week deadline for Nesta to find the Trove, or Elain will take over the task. Nesta confronts Gwyn’s difficult boss, Merrill, and uses her dark power to intimidate her. The next day, more priestesses join the training group on the roof.
When Nesta finally attempts to scry again, she is unable to concentrate and is overwhelmed by memories of the Cauldron. That night, she has a nightmare, and the Cauldron’s power nearly pulls her back. Azriel and Cassian rush to help, and Rhys enters her mind to calm her, shaken by the experience. The next day, Rhys shares troubling news about Feyre’s pregnancy, which might be complicated by the baby’s Illyrian wings. Cassian and Nesta later discuss Feyre’s possible risks, and Nesta volunteers to scry for the Dread Trove again, this time under better conditions at the river house. In a deep trance, she reveals that the Mask is hidden in the Bog of Oorid.
Cassian, Nesta, and Azriel journey to the Bog to find the Mask, but they are ambushed by Eris's soldiers. As Cassian fights to protect Azriel, Nesta is attacked by a kelpie and forced to fight for survival. When she puts on the Mask, she gains control over the dead and commands them to defeat the kelpie. Cassian and Azriel find her after the battle, and she emerges from the water holding the kelpie’s head. The Mask is deemed indestructible, and Rhys uncovers a connection between the kelpie’s language and ancient Fae speech. After the ordeal, Nesta reflects on the Mask’s power, realizing it offers her an escape from her emotions. She later shares an intimate moment with Cassian, signaling the deepening of their emotional bond as they navigate their complex relationship.
The training group on the rooftop has expanded to eleven priestesses, and Nesta continues to focus on her physical and mental growth. Gwyn teaches her about the Valkyries’ mental control techniques, which Nesta hopes will help quiet her emotions. After learning how to handle a sword during a training session with Cassian, she experiences a newfound focus and energy, which drives her to climb 6,000 stairs in a single evening. Gwyn later coaches her in the Valkyrie technique for mental stillness, which brings Nesta peace after several attempts.
Cassian then takes Nesta to a blacksmith’s shop, where she forges her own weapons—swords and daggers. By the end of the day, her technique has improved. Back at the House of Wind, she feels empowered and no longer helpless. However, after sparring with a punching block, the wood begins to smolder and dissolve into ash. The next day, the court receives a visit from Helion, Lord of the Day Court, who helps them with the enchanted soldiers and suggests additional protections for the Mask. Nesta’s blood is used in a spell to strengthen the enchantments on the Mask, though she refuses to know how to break it, protecting herself from its temptation.
That night, Cassian finds Nesta reading about battle tactics, and they resume their physical relationship, still denying the emotional connection between them. The next morning, Cassian learns that Nesta has unknowingly cursed the weapons she forged, and everyone believes they are enchanted. Amren urges Rhys to use the weapons to become high king, but he rejects the idea. Later, Nesta, Cassian, and Eris meet secretly in the Spring Court, where Nesta puts Tamlin in his place after he threatens them.
As training continues, Cassian realizes that Nesta and Gwyn are incorporating Valkyrie techniques, and he promises to teach them as well. Cassian also reflects on Nesta’s past, recalling her love for music and dancing, which he believes helps explain her ability to learn balance so quickly. One day, Nesta finds out that the group voted to keep the magical weapons a secret from her, and she confronts Amren in anger, revealing Feyre’s life-threatening pregnancy. This devastates Feyre and enrages Rhys, who orders Cassian to take Nesta out of the city. Filled with remorse, Nesta retreats to the mountains with Cassian for a few days to atone for her actions.
During their hike, Nesta struggles with self-destructive thoughts and refuses to drink water when she passes out from dehydration. Eventually, she breaks down emotionally, feeling guilty about her past mistakes. Cassian comforts her, telling her that she doesn’t need to fix herself, but only to forgive herself in order to move forward. Once her emotional storm passes, Cassian helps her regain focus by teaching her a sword maneuver, which she performs flawlessly. This practice calms her, as the sword becomes an extension of herself, and she begins to find peace in her training once again.
Gwyn hangs a white ribbon in the training area, symbolizing the Valkyrie’s test of completing their training by slicing the ribbon in half with a sword. None of the trainees can do it except Cassian. Later, Gwyn invites Nesta to attend an evening musical service, where Nesta confesses how much she misses music. At the service, she becomes entranced by the beautiful melodies, and as she listens, she unexpectedly finds herself in the Prison, where she discovers the third item of the Dread Trove—the Harp. She informs Cassian, and Rhys agrees to lift the enchantments so they can enter. When they reach the Prison, Nesta forms a mental link with Briallyn, who is wearing the Crown. In the process, Nesta inadvertently releases Lanthys, an immortal who almost kills Cassian. Nesta successfully uses her magical sword, Ataraxia, to defeat Lanthys and transport herself and Cassian to the river house.
At the river house, Rhys strategizes, and Feyre suggests that Nesta charm Eris during the Winter Solstice festivities to keep him as an ally. Despite Cassian’s objections, Nesta agrees. A month later, as the Solstice celebration begins, Nesta captivates Eris with her dance, and by the end of the evening, he asks for her hand in exchange for his loyalty to Rhys. At a party later, Nesta reflects on her past behavior and reconciles with Elain, though she still doesn’t speak to Amren. Cassian gives Nesta a Symphonia, a small object that plays music, but she initially rejects it due to feeling unworthy of his love. After some emotional reconciliation, they share a night together in bed.
Cassian leaves for three days, and Nesta spends time with Gwyn and Emerie at the House of Wind. They weave knotted thread bracelets while making wishes for each other’s happiness and friendship. Back in training, the new Valkyries succeed in slicing the ribbon, showing their growth. The training area becomes more difficult as Cassian and Azriel create a grueling obstacle course that no one can conquer alone. Eventually, Nesta, Gwyn, and Emerie succeed, proving their strength and completing the Blood Rite Qualifier, even though they are excluded from the Rite because of their gender.
Nesta, now ready to face the 10,000 steps, ascends to the top and apologizes to Amren for her past behavior. Amren forgives her and accepts her back into the Court of Night as a royal member. As spring approaches, Eris warns of impending danger from Briallyn, and tensions rise. Eris also expresses anger at not being told about the Harp and proposes to Nesta, which she rejects. Cassian then declares that Nesta is his mate, which frightens her. In a moment of conflict, Nesta asks Cassian to leave, fearing that her emotions will lead to hurtful words. He agrees and leaves, allowing Nesta to spend time with Emerie and Gwyn. However, their peaceful night is interrupted when they are abducted by Devlon’s troops, and Cassian, with Rhys’s help, eventually discovers their kidnapping, realizing that they are being forced to participate in the Blood Rite.
Nesta wakes up among drugged Illyrian males, her wings bound and only wearing a nightgown in the freezing cold. Realizing the Blood Rite has separated her from her friends, she takes advantage of a dagger stuck in a tree and uses it to kill one of the males. As she searches for Gwyn and Emerie, Cassian is desperately trying to locate the females, knowing he can’t interfere with the Rite’s rules without risking death. After dispatching a few more enemies and using enchanted bracelets to track her friends, Nesta eventually finds Emerie, who is badly injured after jumping into a river to escape her captors. They regroup and continue their search for Gwyn.
Meanwhile, Cassian and Azriel are tracking Eris, who has been captured by Briallyn, but are deceived by an illusion created by Koschei. Back in the Blood Rite, the Valkyries fight their way through opponents and reach the mountain’s base. Gwyn, injured, insists on continuing despite the dangerous route ahead. The three women navigate treacherous terrain and defeat more warriors, including Balthazar’s group, using a rope to outwit their pursuers. As they approach the summit, Gwyn struggles with her injuries, and Nesta stays behind to fight Bellius, allowing Emerie and Gwyn to escape.
Cassian arrives just in time to kill Bellius and end the battle, though he is under Briallyn’s control. When Nesta refuses to hand over the Dread Trove, Briallyn commands Cassian to kill Nesta, but his love for her breaks the spell, allowing Nesta to destroy Briallyn. As the two are reunited, they are urgently called back to the river house, where Feyre is in labor and at risk of dying. In a desperate move, Nesta uses the Harp to stop time and asks the Cauldron to save Feyre, offering to return all the power she took. The Cauldron intervenes, saving Feyre and her family, and even reshaping Feyre’s anatomy for future winged births.
Afterward, Nesta confesses her love for Cassian and agrees to be his mate, with a promise for an elaborate ceremony. Rhys gifts her the House of Wind in gratitude for her role in saving his family. Nesta finally accepts her place in the Fae world, feeling deserving of love and belonging.
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