The world premiere of South Solitary will open the 57th Sydney Film Festival next month.
Starring Miranda and Barry Otto, the film is among 157 selected from 47 countries for the 2010 program.
Director Shirley Barrett admits the film is not finished yet, but she promises it will be come June 2.
“We’re madly trying to finish it now, we’re in the last stages of the mix,” she said.
“It’s exciting for us to have its first public screening in a beautiful theatre on a big night,” she added.
Set in the 1920s, the film is about the arrival of a spinster (Miranda Otto) on a remote island where her uncle is the lighthouse keeper.
The theme of this year’s festival is “Unleashed”.
Festival director Clare Stewart says the addition of an official competition this year has helped the selection process.
“We’re attracting films direct from the Cannes Film Festival,” she said.
One of the 11 films competing for the $60,000 prize is Cannes’ closing night film The Tree, directed by Julie Bertucelli and shot in Boonah, Queensland.
Closing the festival will be the Australian premiere of The Kids Are Allright, directed by Lisa Cholodenko and featuring Annette Benning, Julianne Moore and Mia Wasikowska.
Stewart hopes the diverse program encourages people to embrace different films from all over the world.
“The notion of Unleashed is about leaving all your preconceptions behind and coming to the festival for those new experiences,” she said.
The festival runs from June 2 to 14 at venues across Sydney, including the Opera House, the Art Gallery of New South Wales and the State Theatre.