Conan and his comrades learn that Eisuke's father attended a meeting with men in black suits and believes that he and Eisuke may be part of the Black Organization.

Satou has a ring on her left hand ring finger, which all the officers believe was given to her by Takagi, thus, making them angry at him. Satou receives a call from Ran that there was a murder. A fifty-two year old mystery author is murdered.