A series of bloody robberies is terrorizing Emilia Romagna. The only lead is the criminals' car, a white Uno. Valerio Maldesi, a police inspector in Rimini, stumbles upon the gang during an investigation in which a colleague and friend is killed. Determined to unmask the culprits, he begins a meticulous analysis of their methods, identifying one of the robbers as a police officer from Bologna. Thwarted by his superiors, who prefer to accuse Slavs and terrorists, the inspector decides to infiltrate the gang, composed of unscrupulous police officers with a history of violent practices. Having gained their trust, he brings them to justice after much difficulty, even managing to identify a spy within his own police department.