Kogoro, Ran, and Conan are at their usual diner but learn that their waitress' brother is a suspect in a murder. The waitress, Azusa Enomoto, is interrogated by the authorities about her brother Sugihito Enomoto. When a package containing cookies is delivered to Azusa, she leaves to go shopping while Takagi accompanies her. Takagi returns revealing Azusa escaped from him and is deduced to be meeting her brother. Conan reveals that Touji Kawase is the murderer by revealing how Touji knew that the man was beaten to death with a rifle and not shot by it. Conan then reveals that there was a message on the ribbon of the package. Conan explains Touji sent the message to Azusa in order to take her phone which holds a photo confirming Sugihito's allibi. Azusa finds her brother in a warehouse and is knocked unconscious by Touji. Touji confesses to the murder and reveals it was to cover up the money he lost in the stock market. Touji attempts to force Sugihito to commit suicide in exchange for his sister's life. At that moment, Sato arrives and arrests him.

Eri takes Ran and Conan to a dinner with a friend but later her friend is found murdered. Conan figures the suspect is the friend but her alibi stands solid.