Sawed-Off Shotgun (1977)

Giovanni Molet is sent to jail for the murder of two of the Carraro family over a feud over land. While incarcerated, a vendetta is carried out on Molet's brother who is killed by the Carraros. While being transferred to another prison, Molet manages to escape and goes on the run. He holes up in a large villa owned by a newlywed couple and slowly starts to prepare for his revenge.