In Emilia Romagna, a ruthless gang is committing brutal robberies. Their only distinguishing feature: a WHITE UNO. After extensive investigations and tailing, Inspector Valerio Maldesi and Rocco uncover a connection between the criminals and the police.

Valerio, Rocco, and Judge Soavi are incredulous that a police officer is part of the gang, and the case is closed. But the bandits reopen it, returning to action with the UNO BIANCA. Our men resume their pursuit, but now they know who they're tailing.