Ο Παράδεισος ανοίγει με αντικλείδι - Flying Ants / 1987

In Athens during the 1950s, two children meet an acrobat (Ian Dury) and his assistant, who make their living doing dangerous stunts. When the assistant is arrested, the children decide to help the acrobat rescue her. The police chase them, but they manage to escape thanks to the acrobat’s balloon. 

Director: Vasilis Boudouris

Writers: Vasilis Boudouris, Petros Tatsopoulos

IMDB:  http://www.imdb.com/title/tt0180038/