Le Protecteur (1974)

Recently released from prison, Samuel Malakian, a wealthy architect, investigates the disappearance of his daughter, Nathalie, kidnapped by thugs linked to the underworld. When he discovers that she is a prostitute, he will descend into the slums of the city and rub shoulders with these dangerous environments. For him, from now on, all means will be good in order to find the fruit of his entrails.