When an heiress drowns in a hotel pool, Conan and Sera are on the scene to drag the truth to the surface. Then a screenwriter is found dead in a scenario straight out of one of her mystery scripts. And Conan and Harley Hartwell investigate a mythical beast in Nagano that seems to be committing very real murders. Meanwhile, Conan tries to learn something-anything-about Rum, the high-ranking Man in Black who's as secretive as he is dangerous. There's also the question of the suspicious little girl who's been living with Sera while monitoring Conan and his friends from a distance. With these mysteries lurking in the shadows, how can Conan keep his mind on his cases?