The Baroness and Prokopis (1970)

After decades of absence, noble Baroness Zozianna returns home in Athens, Greece. Filled with sweet memories, the wealthy aristocrat retires to her secluded, lavish mansion, determined to preserve her privacy and a precious heirloom, the famous Blue Blanc diamond. However, the rare gem has already caught the attention of an audacious, ruthless gang of criminals hell-bent on stealing it. Now, the crucial task of protecting Zozianna and her inestimable possession falls on a single man: Prokopis Aprokopos, a clueless private investigator and unlikely bodyguard. Has Prokopis bitten off more than he could chew?