In "The Lost Hero" by Rick Riordan, a character brings up a photograph that features a sandy-haired boy, prompting a question about his identity. The response from Annabeth reveals a sensitive topic, as she reacts with a tight expression, indicating it’s a difficult subject for her.
She informs the questioner that the boy's name is Luke and that he has passed away. This revelation carries an emotional weight, suggesting a backstory that adds depth to Annabeth's character and her past experiences.