O lagopodaros (1964)

A professional gun for hire arrives in Greece intent on assassinating the wealthy business entrepreneur, Petros Pelekis, to put an end once and for all to an implacable and long-standing vendetta. However, the businessman is already aware of the American hit man's arrival, and now, his life has turned into a living hell, as he is completely unable to tell friend from foe. But, who would want to harm Petros, and above all, who is the mysterious and ruthless executioner?