The Dinner Table Detective Season 1 Episode 7 There is no such thing as a completely locked room File 1 ( Air Date 2025-05-16 ) Genre Animation, Mystery, Comedy, Crime category. Overview "A famous painter is stabbed in his own studio, pointing to his masterpiece wall painting "Sleeping Beauty" just before dying. Suspects include his art-jacking son, his second wife, and an art magazine writer with whom he supposedly had an affair. Reiko and Kyoichiro investigate how the killer escaped a locked studio, eventually learning of the victim's connection to a certain "Appraisal Queen."".