"Sent to investigate the murder of a fellow Treasury agent, Dennis O'Brien (Dennis O'Keefe) and Tony Genaro (Alfred Ryder) infiltrate the Detroit-based Vantucci counterfeiting ring. Assuming underworld personas, the T-men immerse themselves in the mob. T-Men's semi-documentary flavor (voice-over narration, authentic backgrounds) is contradicted by the hard and sleazy performances of O'Keefe and Ryder who come alive as the brutal hoods they impersonate, and by cinematographer John Alton's expert collaboration: each shot features moody, dissonant lighting and distorted space." Sally Syberg