The stranger of that night (1972)

Aris, a race car driver, meets a guy who looks strikingly similar to him. With obvious curiosity, he tries to find out from his friend Dimitris who this identical "stranger" is. He learns that his name is Kyriakos and that he works in a car repair shop. But Kyriakos, who is connected to Fotini, also learns of Aris's existence, and from his own father he learns that he is his twin brother, who was given up for adoption to a wealthy man, Kaisaris. The latter, as Aris's friend Diana learns, wanted a child to inherit a large fortune. Diana helps Kyriakos become a singer, while at the same time blackmailing Caesar for his strategy. The two brothers eventually find out everything, and Caesar is forced to sabotage Kyriakos' car in order to get him out of the way in the upcoming race...