Director Anthony Mann's hard-boiled, film noir approach coupled with the stylistic cinematography of John Alton make this semi-documentary tale of government treasury agents infiltrating a large counterfeit ring an exciting crime drama. Dennis O'Keefe is great as a hard-nosed agent who slowly earns the trust of the bad guys while his partner, Alfred Ryder, is his equal as the sacrificing newlywed whose duty to his country comes before his duty as a husband. The film offers a fascinating look into the world of undercover work and intrigue and even has an opening segment from the Treasury Office itself.