In "The Yellow House Mystery" by Gertrude Chandler Warner, Violet expresses surprise regarding an old acquaintance, questioning if she knows who it is. Mr. Alden confirms that they are, in fact, all familiar with this person, revealing her identity as Mrs. McGregor. This revelation causes a sense of disbelief among the children, who react with astonishment at discovering the connection.
Their reaction highlights the children's relationship with Mrs. McGregor and suggests that she plays a significant role in the story. The moment emphasizes the theme of unexpected familiarity and the intrigue surrounding the mystery they are trying to unravel. This twist adds to the narrative’s suspense and engages the readers in the unfolding mystery.