Which C.S. Lewis work retells the Cupid and Psyche myth from Psyche's sister's viewpoint?

Till We Have Faces retells the Cupid and Psyche myth from Psyche's sister's viewpoint.

C.S. Lewis published the novel in 1956, describing it as a retelling of the ancient myth of Cupid and Psyche. The narrator is Orual, the eldest daughter of the king of Glome, who becomes a ruler and reflects on her relationship with her half-sister Psyche.

The novel's title comes from a central idea about human beings hiding behind masks or lacking the self-knowledge needed to speak honestly before the gods. Lewis uses the myth to explore jealousy, possessive love, religious doubt, and the painful process of self-understanding.

Till We Have Faces differs from the Narnia books because it is written primarily for an adult audience and draws on classical mythology rather than a secondary fantasy world. Lewis considered it one of his best works, though it was less commercially successful at first than some of his other books.