Robert Firsching in All Movie Guide:
Though not a giallo film in the strictest sense, this crime/revenge film merits attention by fans for its genre cast and an unusual approach to familiar themes. Raf Vallone plays anguished father Avanzio Berzaghi, whose 25-year old daughter Donatella has been kidnapped. Donatella has the mind of a toddler, and her beauty and agreeable naivete make her a perfect choice for Milan’s seedy prostitution racket. Frank Wolff is a dedicated Inspector with bad sinuses who shakes down a sleazy pimp and a desperate black prostitute (Beryl Cunningham of The Snake God), as well as visiting scores of local brothels for clues.