There is no such thing as a completely locked room File 1 (S01E07)

A renowned artist is found fatally stabbed in his studio, and with his last breath, he directs attention to his wall painting "Sleeping Beauty." The list of suspects includes his son, who has a history of stealing art, his second wife, and a magazine writer rumored to have had an affair with him. Reiko and Kyoichiro delve into the mystery of how the murderer managed to flee from a locked studio, ultimately uncovering the victim's ties to a mysterious figure known as the "Appraisal Queen."