In A Court of Mist and Fury, the story follows Feyre Archeron, who is grappling with the aftermath of her traumatic experiences from the previous book. Although she has ascended to the status of High Fae, she is haunted by her past, especially her time Under the Mountain. Feyre is engaged to Tamlin, the High Lord of the Spring Court, but their relationship deteriorates as Tamlin becomes increasingly overprotective and controlling, exacerbating Feyre's PTSD. As she struggles with her mental health, she recalls an earlier bargain made with Rhysand, the High Lord of the Night Court, which requires her to spend one week each month at his court. Initially reluctant, Feyre discovers that the Night Court offers her a sanctuary where she can heal and explore her identity. She becomes close to Rhysand and his Inner Circle, developing a deep bond that ultimately leads her to realize her true love lies with Rhysand, not Tamlin. However, the looming threat of the King of Hybern, who intends to conquer both the faerie and mortal realms, compels Feyre to return to the Spring Court under false pretenses, allowing her to spy on Tamlin and gather crucial information for the impending war.