Il Generale Della Rovere (1961)

During World War II, an Italian con man going by the name Grimaldi exploits the families of those arrested by assuring them he can help, if they'll give him money to bribe the German officers. Eventually, one of his victims turns him in.

Meanwhile, an important figure in the Italian resistance has been killed though the intent was to capture and use him as a bargaining chip. Grimaldi is promised release if he will pose as this man (General della Rovere) while in detention,  in order to expose his conspirators and their plans. Neither he nor the German Colonel who devised the scheme thought his conscience or sense of duty would be a factor in carrying out this assignment.

Though slightly overlong, this story really works. The growth is extremely believable and I was moved.

B+