The novel explores the multifaceted nature of identity, particularly through the character of Angélique. The contrast between her angelic appearance and potentially sinister motives raises questions about the masks people wear and the truth that lies beneath surface appearances.

Through Mathias's physical recovery and his involvement in Louise's case, the story examines how personal healing can come through helping others. His journey from hospital patient to active investigator represents both physical and emotional rehabilitation.

The investigation into Louise's mother's death highlights how family histories can harbor dark secrets. The pursuit of truth becomes not just about solving a crime, but about understanding the complex relationships between parents and children.