The story takes place after the events of the second book, "A Court of Mist and Fury". Feyre, the protagonist, has returned to the Spring Court to gather information and spy on Tamlin, her former lover. However, she soon realizes that her actions have consequences, and she must navigate the complexities of the faerie world.

In "A Court of Wings and Ruin", the characters continue to evolve and grow. Feyre, in particular, undergoes significant development as she navigates her new role as a High Lady and confronts her past mistakes. Rhysand, Cassian, Azriel, and Mor also play crucial roles in the story, showcasing their strengths and vulnerabilities.

Meanwhile, Rhysand and his inner circle, including Cassian, Azriel, and Mor, work tirelessly to strengthen their forces and protect their lands. The novel explores themes of love, loyalty, friendship, and the struggle for power in a world where faeries and humans coexist.