In Georgette Heyer's "Devil's Cub," the characters reflect on their mistakes regarding the identity of a friend. The narrator expresses regret for not realizing that Juliana's friend is actually Mary Challoner. This moment of clarity points to a larger theme of oversight and misjudgment among the characters.

Rupert, another character in the scene, is also called out for his lack of discernment, suggesting that both characters are guilty of failing to see the obvious. This exchange highlights the foolishness inherent in their assumptions and adds depth to their interactions, emphasizing the narrative's exploration of misunderstanding in relationships.