The film was seized by the courts when the producer went bankrupt in 1974, during the final stages of production. Tied up in legal wrangling, it wasn't released theatrically until 1997.
The film was so low budget, after two days of shooting, Bava had to fire Cinematographer Emilio Varriano and take over that job himself in order to have enough money to complete the film.
After his career hit a slump, Bava hoped this film would revive him by showing that he could compete with his contemporaries in the Italian polizia genre.
Was not released until 1997, 23 years after it was made.