- Meiko (Michiko Kichise) is the young wife of Takamitsu Temiyako, a president of a large medical corporation. Dr. Tokito Takahiko (Abe Hiroshi) is an employee of the large medical corporation. This evening, Meiko and Tokito will implement their plan to murder Meiko's husband and frame his death as a suicide.
Tokito uses a rope from his balcony to climb to the 6th floor and heads for the bathroom. He goes ahead and completes his mission. While Tokito leaves the office he then becomes trapped in the elevator, which is turned off at 5:30.
Meanwhile, Tokito's Alfa Romeo is stolen by two young people. As Meiko waits for Tokito in a nearby cafe, she sees Tokito's Alfa Romeo drive by, but with a woman in the passenger seat.
The couple that stole Tokito's Alfa Romeo then checks into a villa using Tokito's name. A murder occurs at the villa that is widely reported by the news.
In the morning, the elevator turns back on and Tokito is finally able to leave the office. He is now the prime suspect in a murder he didn't commit.