Police investigate a series of mysterious murders where the only clue is a strange buzzing noise at the scene of the crime.
Chief Inspector Wakabayashi
Akiko Hayakawa
Dr. Tsukioka / The Invisible Man
Mieko
Sugimoto
Detective Hayama
Dr. Hayakawa
Chief of the Metropolitan Police
Kôkichi Kusunoki / The Human Fly II
Yamada / The Human Fly I
