Lou Caspari is confronted with a client whose defense she is strongly advised against. Mario Lenzi is notorious as a professional killer who works for the Mafia and has managed to wriggle out of all charges in the past. Now the public prosecutor's office believes it has watertight evidence and is charging Lenzi with the murder of a mafia boss and his family. However, Lenzi insists that he had nothing to do with the murder and that he has been set up.