Testi plays an undercover cop who "Dirty Harrys" the bad guys into oblivion. There is great music from the band who did "Suspiria," a groovy prog rock band. Full of escalator stunts, bike stunts, plane stunts, and Testi jumping from high places and flipping around avoiding bullets. Once the film picks up the pace its a squib frenzy and a murder-pocalypse. This is a pretty decent Castellari film.