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...

Real estate company president Hiyama is murdered while holding a pair of scissors. The crime scene is very similar to that of an unsolved case from 17 years ago. Conan and Okiya believe former candy shop owner Senba who discovered the body is the culprit, but are unable to determine how he brought the weapon inside the annex where the crime took place. Later, Conan and Okiya question the bodyguards standing at the entrance and identify the trick the culprit used to bring the weapon inside. They even find the weapon, and they begin solving the whole case...