Voice Without a Shadow

Ishikawa, a newspaper journalist, unexpectedly meets Asako, a woman who used to work for his company some time ago as a phone operator. Three years ago, she accidentally heard the voice of a suspect who committed a still-unresolved homicide. Since then, the suspect's voice has remained lodged in her mind as a terrifying memory. One night, her husband invites over his colleagues, Kawai, Hamazaki, and Muraoka. She realizes that Hamazaki's voice sounds exactly the same as the unseen suspect's! (imdb)