Grandads-Robbers (1972)

An old detective does not want to retire, especially if the reason for his retire is to free a place for stupid young "promoted-by-the-tops" guy. The only way out is to convince the boss that hero still can effectively investigate complex crimes. Together with his going-to-be-retired engineer friend he decides to commit a perfect crime himself and then quickly solve it. But the first attempt of ideal crime is unexpectedly unnoticed by anyone; and after convincing their female fried, a bank employee, to participate in another "fake crime" scenario, they face a real trouble: money are finally grabbed by actual criminal.