Italian censorship visa # 81965 delivered on 30-10-1986.
Italian filming locations in Rome included the Colosseum and its basement, St. Peter's Basilica, and streets of the city's historic center.
The picture was filmed in English to make the movie easily exportable to European and American markets.
Publicity for this picture declared that its filming exteriors were: "Postcard Rome".
The film's director Gabriele Lavia said of this movie: "I wanted to make a 'film noir' with an eye on [Cornel] Woolrich, [Edgar Allan] Poe and [Alfred] Hitchcock."