The Security System's Pitfall Kogoro is hired by Junko Miyoshi to catch a thief. While working the case, the body of Junko's neighbor Naotsugu Kitagami is discovered in the parking lot behind her apartment building. Kogoro believes Kitagami got drunk and accidentally fell from his apartment balcony. Inspector Megure and the police investigate the room and Conan finds it strange that Kitagami left his front door unlocked when his apartment was fully equipped with anti-theft devices. Conan questions Ryosuke Sawada, the resident of number 604 directly below Kitagami's and believes Kitagami's death was not an accident.