A down-on-his-luck ex-GI finds himself framed for an armored car robbery. When he’s finally released for lack of evidence–after having been beaten up and tortured by the police–he sets out to discover who set him up, and why. The trail leads him into Mexico and a web of hired killers and corrupt cops.
Alternative titles: Los cuatro desconocidos | Der vierte Mann | De vierde man | Le quatrième homme | Os Quatro Desconhecidos | Politiet jager fire maskerede mænd | El cuarto hombre | Fyra maskerade män | Neljän naamion salaisuus | The Secret Four | O 4os anthropos | Egymillió dolláros zsákmány | Il quarto uomo | アリバイなき男 | O Segredo dos Quatro | Confidential Kansas City | 4 maskerade män | Cetrti clovek | Тайны Канзас-Сити | Kansas City 117 | Poverljivo iz Kazas Sitija