48화: 하타베 헤이지가 외교관 츠지무라 이사오의 밀실 살인 사건을 조사하는 동안, 코난은 감기가 악화된다.

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Hattori Heiji, a high-school detective from the west side of Japan, is searching for Kudo Shinichi to test his skills. To help an ill Conan with his cold, Heiji offers him an unknown drink, revealed to be baijiu (an alcoholic drink). Soon after, Tsujimura Kimie, wife to diplomat Tsujimura Isao, wants Kogoro to investigate her son Tsujimura Takayoshi’s girlfriend, Katsuragi Yukiko, believing she is too perfect. Kogoro and the gang are invited to Kimie’s estate where they enter Isao’s study. Kimie tries to wake up the seemingly sleeping Isao, only to discover him dead. Heiji and Conan discern Isao was killed by a needle dipped in a powerful neurotoxin and his death was recent. The room, however, was locked. Isao and Kimie are the only ones with access to the study. Conan and Heiji attempt to deduce the locked room mystery, the reasons the stereo was playing loud opera music, and the stack of books placed in front of Isao. Conan's cold worsens, causing him to be bedridden in another room, while Heiji discovers the murderer‘s method: the culprit placed scotch tape inside the key holder and pierced a string through the victim's pocket, allowing the culprit to leave the room, lock the study, and pull the string causing the keys to slide back into the victim's target. As evidence, Heiji found some string and needle in the trash. With Conan out of action, Heiji proceeds to reveal Isao‘s killer. (Source: Wikipedia)