The Actress Blogger's Locked Room Case (2) Meitantei Conan : Season 1 Episode 815

Kyona is found murdered in her locked hotel room. Based on their hatred for each other, in addition to Saya's actions, Conan believes she is the culprit. Conan remembers what Kyona said previously about Saya’s secret and tries to uncover it from her blog. After talking with the Detective Boys, he figures out the trick to the locked room!