Amor Indiscreto

In French Indochina, a magistrate is assigned to investigate the murder of his boss. Unknown to him, the boss had a policy of requiring the wives of his subordinates to sleep with him if they wanted their husbands to get promoted. What he also didn't know was that his wife was in the boss' office when he was killed. Complications ensue.
The movie was considered lost for decades untill an Italian archive found a copy in April 2017.