Agatha Christie, one of the most famous writers for crime novels, explores the connection between reality and fiction in her stories. Harley Quin is a mysterious figure and Parker Pyne helps his clients with practical instructions, while the two play with the terms fiction and reality through creating a scene. The description of reality in Christie’s fictional works shows the fragility of terms like fiction and reality, and readers are confronted with the similarities between imaginary world and reality through Christie’s different two detectives.