Author Keigo Hiura's assistant Chiaki Minazuki is found strangled to death in a hotel room directly below his. Conan and Sera are certain he committed the crime, but cannot find a hole in his alibi. After learning of the condition of Minazuki's room they get closer to the truth. After seeing and hearing more, Conan and Sera realize how Hiura manipulated his alibi...

After Akiyama is attacked, Ran accompanies to her to the hospital. Kogoro and the others continue investigating the checkpoints. After arriving at the museum, Conan checks the four cards that fell out of Akiyama's bag.