The body of murdered neighborhood nuisance Amagi is discovered, and neighborhood association president Bando also appears to have been poisoned pesticides. The police believe Bando chose to kill himself after murdering Amagi, but...

Kogoro is hired to catch a thief. While working the case, the body of Junko's neighbor Kitagami is discovered in the parking lot behind her apartment building. Kogoro reasons Kitagami got drunk and accidentally fell from his room, number 704. Conan finds it strange that Kitagami left his front door unlocked when his apartment was fully equipped with anti-theft devices...